I have yet to implement this but I think a really good idea for blog comments is to link your blog post to a fediverse post. It has been posted here on HN several times already so you can google it but people have done this already.
That way you get the moderation of the fediverse, an account on some AP instance is required, but you can still display the comments on your website with embedded JS.
Also if you think this sounds neat and don't have a blog setup of choice already, writefreely is both easy to self-host and has public and free instances: https://writefreely.org/
That way you get the moderation of the fediverse, an account on some AP instance is required, but you can still display the comments on your website with embedded JS.