You don’t need to change them to <div>. The correct solution is to fix the heading hierarchy.
Edit the page, click the Heading widget, and set the proper HTML Tag (H1, H2, H3, etc.)
Use only one H1, then H2/H3 for sections.
For non-heading text, use a Text Editor or set the tag to p/div instead.
Sorry I did not understand, I am new at WordPress, I don’t know where to acess these areas like h5 recent post or h4 customer reviews and h2 reviews or h4 recently viewed