How to increase the size of this figure?

I’m making a figure with four graphs next to each other but I want the graphs to be larger (without changing position). I don’t mind giving up some of the margin for this, but how do you do this in latex? I have tried a couple of things but then the figure is not centered anymore.

Here is my code:

begin{figure}[H]
centering
begin{subfigure}{.5textwidth}
centering
 begin{center}includegraphics[width=1.0linewidth]{Figures/fundvsprice.pdf}end{center}
  vspace{-0.45cm}
  subcaption{Fundamental versus real values}label{fig:1a}
end{subfigure}%
begin{subfigure}{.5textwidth}
  centering
begin{center}includegraphics[width=1.0linewidth]{Figures/fundvsprice.pdf}end{center}
  vspace{-0.45cm}
  subcaption{Fundamental versus real values}label{fig:1b}
end{subfigure}%

begin{subfigure}{.5textwidth}
centering
 begin{center}includegraphics[width=1.0linewidth]{Figures/fundvsprice.pdf}end{center}
  vspace{-0.45cm}
  subcaption{Fundamental versus real values}label{fig:1c}
end{subfigure}%
begin{subfigure}{.5textwidth}
  centering
begin{center}includegraphics[width=1.0linewidth]{Figures/fundvsprice.pdf}end{center}
  vspace{-0.45cm}
  subcaption{Fundamental versus real values}label{fig:1d}
end{subfigure}%
caption{General caption.} label{fig:1}
end{figure}