Voyager is the best at the moment. There are a few other full featured ones. People always recommend Jerboa but when I looked at it I think it was lacking moderation tools. I’ve also used Sync, Thunder, and something else. You’re on the right one now. No need to change.
The only feature that I am after still is the ability to browse other instances without searching. You can’t do that yet in Voyager.
Are you having specific trouble with something?
I’ve been using this account for over a year since the Rexodus. Haven’t had this disinterest problem. Do I wish there were more users, sure, but it takes time. Work on making this place great and they will continue to move here. Create, mod, or just post to a niche community.