Transfering text

Question

I need to transfer section 5.3 after the pictures but \pagebreak and \vspace seem to do nothing

enter code here begin{figure} [h!]
\centering
\includegraphics[scale=0.55]{Immagini/opt gen}
\caption{Data comparison technique.}
 \end{figure}
  \begin{figure} [h!]
\centering
\includegraphics[scale=0.35]{Immagini/opt variables}
\caption{Data comparison technique.}
    \end{figure}
\begin{figure} [h!]
\centering
  \includegraphics[scale=0.70]{Immagini/opt termination}
    \caption{Data comparison technique.}
    \end{figure}
 As for the termination parameter, this can be express as: the ratio between of the sum of 
     the squared difference between the simulation values and the experimental ones at the 
    end of the data matching and the its initial value must be less than or equal to a 
          fixed value (i.e. 0.05)
     \begin{equation}
        \frac{\sum_{i=1}^{n}((y_{i}-\bar{y})^{2})_{fin}}{\sum_{i=1}^{n}((y_{i}- 
        \bar{y})^{2})_{in}}=\epsilon
       \end{equation}
\begin{figure} [h!]
 \centering

\includegraphics[scale=0.55]{Immagini/opt obj}
  \caption{Data comparison technique.}
      \end{figure}
           The final objective is to achieve a data matching according to the termination 
               parameters and the boundary conditions set.
             \vspace{100mm}
            \section{Conclusion}