How to add a "load more" for 9+ blog posts (grid)

Hi I need to have the blog landing page (grid-style, with 9 boxes) “load more” when you get to the bottom with a button or some other way. How can I do this?

[Someone did a workaround for this on another Fortuna blog my company has, but then there were no actual Blog "posts" in the WP section where blog posts usually reside. They made the each blog post as an actual page in the "Pages" section. I'm not sure that it a good idea. Could you also comment on that?]

Thanks so much for your time, Cynthia