I asked another commenter here the same question that I'm going to ask you.

I was running a my own single user instance, but I had a hard time getting comments to come in to mine. Have you found a good way to get Lemmy to more reliably pull in comments from remote instances?

I would have to browse out to the original instance to see most of the comments, then back to my own if I wanted to comment (if it was under a comment that my instance hadn't pulled in, then too bad), then back out to the main site to continue reading. I found that process very tedious so I switch back to a more populated server which seems to pull in most if not all of the comments.