Texts are not moving from first page to second page

You have to make to start a new page before a cvsection to have good titles alignment and also "call" the page2sidebar

clearpage
cvsection[page2sidebar]{Education}

This is the main code: (geometry setup changed)

documentclass[10pt,a4paper,ragged2e]{altacv}

% Change the page layout if you need to
geometry{left=1cm,right=11cm,marginparwidth=8cm,marginparsep=1.5cm,top=1.25cm,bottom=1.50cm} % changed<<<<<<<<<<<

% Change the font if you want to, depending on whether
% you're using pdflatex or xelatex/lualatex
ifxetexorluatex
  % If using xelatex or lualatex:
  setmainfont{Carlito}
else
  % If using pdflatex:
  usepackage[utf8]{inputenc}
  usepackage[T1]{fontenc}
  usepackage[default]{lato}
fi

% Change the colours if you want to
definecolor{VividPurple}{HTML}{3E0097}
definecolor{SlateGrey}{HTML}{2E2E2E}
definecolor{LightGrey}{HTML}{37474F}
colorlet{heading}{VividPurple}
colorlet{accent}{VividPurple}
colorlet{emphasis}{SlateGrey}
colorlet{body}{LightGrey}

% Change the bullets for itemize and rating marker
% for cvskill if you want to
renewcommand{itemmarker}{{smalltextbullet}}
renewcommand{ratingmarker}{faCircle}

%% sample.bib contains your publications
addbibresource{sample.bib}
usepackage{hyperref}
begin{document}
name{Kazi Ziaul Hassan}
tagline{Problem Solver, Competitive Programmer}

% Cropped to square from https://en.wikipedia.org/wiki/Marissa_Mayer#/media/File:Marissa_Mayer_May_2014_(cropped).jpg, CC-BY 2.0
photo{2.5cm}{American-passport-photo}
personalinfo{%
  % Not all of these are required!
  % You can add your own with printinfo{symbol}{detail}
    email{Computer Science and Engineering, BSc-CSE(KUET)}
    
    location{Khulna}
    
    
%   orcid{orcid.org/0000-0000-0000-0000} % Obviously making this up too. If you want to use this field (and also other academicons symbols), add "academicons" option to documentclass{altacv}
}



%% Make the header extend all the way to the right, if you want.
begin{fullwidth}
makecvheader
end{fullwidth}

%% Depending on your tastes, you may want to make fonts of itemize environments slightly smaller
AtBeginEnvironment{itemize}{small}    

cvsection[page1sidebar]{Basic info}
printinfo{Contact}{+8801679388394}
printinfo{Email}{[email protected]}   
printinfo{Linkedin}{href{https://www.linkedin.com/in/kazi-ziaul-hassan/}{Kazi Ziaul Hassan.}}
printinfo{StackOverflow}{href{https://stackoverflow.com/users/9258528/kazi-ziaul-hassan}{Kazi Ziaul Hassan}}
printinfo{Stopstalk}{href{https://www.stopstalk.com/user/profile/Crackeree}{Kazi Ziaul Hassan}}
printinfo{Codeforces}{href{https://codeforces.com/profile/Kazi_Ziaul_Hassan}{Kazi Ziaul Hassan}}
printinfo{Codechef}{href{https://www.codechef.com/users/crackeree_61}{crackeree_61. . . .}}
printinfo{Lightoj}{href{https://lightoj.com/user/kazi-kuet}{Kazi Ziaul Hassan}}
printinfo{Uhunt}{href{https://uhunt.onlinejudge.org/id/904351}{Kazi Ziaul Hassan. . .}}
printinfo{Hackerrank}{href{https://www.hackerrank.com/kazi_kuet?hr_r=1}{Crackeree CRAK}}
printinfo{Virtual Judge}{href{https://vjudge.net/user/1607061}{1607061. . . . .}}
printinfo{Spoj}{href{https://www.spoj.com/status/crackeree/}{crackeree. . . . . . . . . .}}
printinfo{Hackerearth}{href{https://www.hackerearth.com/@kazi15}{Kazi Ziaul Hassan}}  

printinfo{Timus}{href{https://acm.timus.ru/author.aspx?id=246535}{Zia}}

printinfo{Date of Birth}{28th January, 1998}

printinfo{Blood Group}{O+ve}

printinfo{Address}{Holding No: 71,

Middle Arichpur, Tongi, Gazipur}

vspace{10px}

cvsection{About me}
begin{itemize}
item I am a final year student of Computer Science and Engineering department in KUET. I am adept in competitive programming and problem solving. Highly ambitious, hard-working, team player, leader, adamant, very optimistic, enthusiastic, responsible and punctual. I love to learn new things and do challenging tasks. I also love mathematics, coding, traveling, bike riding, tasting delicious food and Cricket. I believe, "The more you mistake, the more you know. The more you know, 
the less you fear".
end{itemize}

vspace{10px}

cvsection{Work Experience}

cvevent{Former math and chemistry teacher}{Udvash}{Aug 2017 -- November 2019}{Khulna}
vspace{10px}

cvevent{Text and image annotator}{Next-Solution Lab}{Nov 2020 -- Dec 2020}{Dhaka}
vspace{10px}


cvevent{Audio annotator team leader}{Intel't Machines}{Jan 2021 -- Mar 2021}{Dhaka}
vspace{10px}

%cvevent{Aircraft Maintenance Engineering Internship }{Air %Algerie}{sep 2017 -- Jan 2018}{Algeria, Algiers}
%begin{itemize}
 %   item Establishment of a Peer-to-peer ATC communication %simulation.
   % item Troubleshooting and maintnance of a weather Radar .
%end{itemize}

clearpage
cvsection[page2sidebar]{Education}

cvevent{B.Sc in Computer Science and Engineering}{
Khulna University of Engineering and Technology
}
{Jan 2017 -- Ongoing}{Khulna}
{faMortarBoard CGPA: 3.37/4.00 (upto 6th semester)}

vspace{10px}
cvevent{Higher Secondary Certificate}{Gpvt Science College hfill faMortarBoard GPA: 5.00/5.00}{Jan 2014 -- Dec 2016}{Dhaka}
vspace{10px}
cvevent{Secondary School Certificate}{Siraj Uddin Sarker Vidyaniketan & College hfill faMortarBoard GPA: 5.00/5.00  }{Jan 2011 -- Dec 2013}{Gazipur}
{faMortarBoard Got General Grade Stipend}

end{document

This is page1sidebar.tex

cvsection{Achievements}

cvachievement{faTrophy}{Best Team Award, 2019}{My team participated in Intra KUET Programming contest. We achieved the "Best Team Award" from our batch.}
cvtag{Onsite Contest} 
cvtag{Teamwork}
cvtag{Decision Making}
cvtag{Problem Solving}
cvtag{Algorithm}
cvtag{Data Structure}

divider

cvachievement{faTrophy}{Champion, IKMO, 2017}{I participated in Intra KUET Mathematics Olympiad  (IKMO). I became the champian.}
cvtag{Advanced Mathematics} 
cvtag{Decision Making}
cvtag{Problem Solving} 

divider

cvachievement{faTrophy}{StackOverflow ~260 Reputation, Gold Badge}{I gave solutions to many users who had been facing problems regarding programming languages or other technical issues. I used to post my problems as well. }
cvtag{Debugging} 
cvtag{Proficiency}
cvtag{Problem Solving} 

divider

cvachievement{faTrophy}{Codechef 3 Star Rating}{Codechef is a online progranning contest platform. I achieved 3 star rating.}
cvtag{Online Contest} 
cvtag{Martinet}
cvtag{Decision Making}
cvtag{Problem Solving}
cvtag{Algorithm}
cvtag{Data Structure}

divider

cvachievement{faUsers}{National Collegiate Programming Contest (NCPC)}
{

Rank: 282 in 2018
divider
Rank: 152 in 2019

}
cvtag{Online Contest} 
cvtag{Martinet}
cvtag{Decision Making}
cvtag{Problem Solving}
cvtag{Algorithm}
cvtag{Data Structure}

divider

cvachievement{faUsers}{National Undergraduate Mathematics Olympiad}
{

9th Undergrad Regional Math Olympiad, Khulna, 2017
divider
Status: Certified

10th Undergrad Regional Math Olympiad, Khulna, 2018
divider
Status: Certified

}

divider

cvachievement{faUsers}{Around 1000 Problems Solved}
{
I have solved around thousand problems of various categories and difficulties in Codeforces, UVA, Hackerrank, Codechef, Lightoj, SPOJ, Timus, ACMSGURU etc.
}

This is page2sidebar.tex

cvsection{Skills}

textcolor{SlateGrey}{textbf{Internet Of Things}}
newline

begin{itemize}
    item MQTT Protocol, MQTT broker setup, Mesh Network Design.
    item AWS IoT and Microsoft Azure IoT setup.
end{itemize}

textcolor{SlateGrey}{textbf{Hardware}}
newline

begin{itemize}
    item ESP programming using ESP-IDF, Xtensy-based mcu, ARM-based mcu (STM32x, Cortex ...)
    item  Data Logger Design, Programmable Logic Controller design, VHDL, Power electronics.
end{itemize}   

textcolor{SlateGrey}{textbf{Robotics}}
newline

begin{itemize}
    item Closed Loop Control, SLAM robotics
    item Accelerometer based system (Kallman Filters, quaternion based algorithms).
end{itemize}

textcolor{SlateGrey}{textbf{Software (Backend)}}
newline

begin{itemize}
    item AWS server/CPanel setup (web hosting, Cloud hosting, Restful API, Redis, SQL ..).
    item Linux Kernel API, POSIX, V system, Clustering, Multi-threading, FreeRTOS.
end{itemize}

textcolor{SlateGrey}{textbf{Software (Frontend)}}
newline

begin{itemize}
    item Multi-platform Apps (Cordova, PhonegapBuild, Ionic, QT).
end{itemize}

cvsection{Languages}

English hfill TOEIC (975) 

divider

French hfill C2 

divider

Arabic hfill Native 

cvsection{Other Interests}

cvtag{Basketball}
cvtag{Philosophy}
cvtag{Astronomy}
cvtag{Quantum Mechanics}
cvtag{Classical Music}