Avoid uncessary spaces in Latex

Question

I am writing an article for the first time with Latex, I am using Overleaf as an online editor. I want to avoid unecessary spaces in my article which are the result of figures and adjustment. For example:

We can see how there are many vertical space between the figure and the text, for the next page is the output also in this way:

Solution that I've tried:

• Reduce the size of the image: not optimal because it won't be readable
• Change the float position of the figure from [H] to [h]: it didn't fix the problem, spaces still persist The code used for the first figure and text is :

    \begin{figure}[H]
    \begin{center}
    \setlength{\belowcaptionskip}{0pt}
    \includegraphics[scale=0.8]{images/comparison2.png}
    \centering
    \caption{ORKG Interface for comparison between contribution}
    \vspace{-1.5em}
    \label{fig18}
    \end{center}
    \end{figure}
\noindent{ORKG allows users to specify the structure of type's composition to describe research contributions. Templates are used to facilitate the organization of data by adding, editing or deleting attributes and their allocated information. For example, \autoref{fig19} highlights the specification of the features of describing a dataset:}