If you don't have a comments system on your blog yet or that your current one does not satisfy you, you should check giscus, I am very happy with it.
🗨 If you are currently using Disqus and want to migrate to giscus (while preserving your existing comments), the easiest way I found was to export the Disqus comments in a file, use this tool on GitHub to convert them into issues, and manually convert existing issues to discussions on each issue page. You can read this blog post that partially explains how to do that.
Read about it on the blog of Alexandre Nédélec on the post https://www.techwatching.dev/posts/migrating-blog
🗨 If you are currently using Disqus and want to migrate to giscus (while preserving your existing comments), the easiest way I found was to export the Disqus comments in a file, use this tool on GitHub to convert them into issues, and manually convert existing issues to discussions on each issue page. You can read this blog post that partially explains how to do that.
https://giscus.app/