Hi there! If your theme allows you to use the block editor on the homepage, there is a gallery block which might suit your purposes:
Gallery Block
Alternatively, there may be plugins that are specifically designed for showing reviews/testimonials. One of those might work for you as well:
https://www.ads-software.com/plugins/search/testimonial/
We may be able to provide more tailored recommendations if you can share more details about your site. For instance, what theme are you using?