I recently switched from Disqus to Utterances, which uses a Github repo's issues as the source of comments:

https://utteranc.es/

I used a Python export and conversion script that I found at https://pawamoy.github.io/posts/migrate-disqus-comments-to-u... , and made a couple updates to it (and then commented on that post with my changes).

Pretty happy with it so far.

Here's a couple of my posts that show Utterances in action, one that has a lot of the migrated comments, and one with mostly new comments:

- https://blog.isquaredsoftware.com/2020/05/blogged-answers-a-...

- https://blog.isquaredsoftware.com/2021/01/context-redux-diff...

There are quite a lot of options out there: https://darekkay.com/blog/static-site-comments/

I have seen 2 that look interesting:

https://commento.io/

https://www.remarkbox.com/

You can use static comments https://bsdnerds.org/comments-static-site/