Restore Local Users which got deleted while demoting the domain controller

All my local users on the SharePoint server got deleted while demoting the domain controller.

I’m new to the SharePoint. Without much research, I installed an Active Directory on my SharePoint server. After that it asked me to "Promote the server to the domain controller" and I did this. All my local users came under the domain and also my SharePoint site stopped working.

After that to make the SharePoint site work I demoted the domain controller, but in this process, all the local users got deleted. After this, I cannot connect to the SQL Server, neither SharePoint Central Administrator is working and the site is also not working.

I want to know whether I can restore the deleted users, and put things back to where it was and bring the site online.

I got this thread for reference, but I’m not sure whether it is going to work. Even I don’t want to spoil things even more.
https://support.microsoft.com/en-us/help/840001/how-to-restore-deleted-user-accounts-and-their-group-memberships-in-ac