Do you mean that link that lets you scroll back to the top with a single click? There are plugins for that: https://wordpress.org/plugins/tags/scroll-to-top/
Alternatively, you could certainly build it yourself using any block that lets you add linked text or an icon.
Not to the top, I want a plugin that makes a way to go back and forth or throughout a blog using certain options. “Page 1, Page 2, Page 3 … Page 10, Page 11”
If you mean numbered pagination at the bottom of archive/blog listings, block themes handle that with the Query Pagination block: edit the template that renders your posts list (Appearance > Editor > Templates > Blog/Index), select the Query Loop, and add Query Pagination inside it. You get previous/next plus the numbered page links, and you can set how many posts per page in Settings > Reading. For paginating a single long post, inserting the Page Break block splits it and the theme outputs the page links. No extra plugin needed in either case.
