Number of (active) Lemmy users seems to stabilize and I think this is a great thing. Indeed we got a lot of users when reddit shutdown its API (I was among them despite being a long time oss user), many have left, but the community seems now to stabilize to ~ ½ of the big grow in june '23. I think this is very nice for lemmy, we can be proud of this project.
The stats come from: https://fedidb.org/software/lemmy
Ostensibly they were often themed around one thing, but the ones I hung around had most of the activity in general conversation subforums rather than niche interest ones. In that way I don’t feel it’s dissimilar to lemmy.