I use Hyvor Talk - https://talk.hyvor.com - for ad-free and privacy respecting commenting on my blog. I really wanted something that I can just use as a service, not host anything myself. But it's quite expensive.

If I where to ditch it to save the money, I'd look into integrating Mastodon into the page, I saw somewhere that they used Mastodon as their comment system (it's basically a thread on Mastodon that is embedded in the blog page).