It seems the fediverse is continuing and growing again. Line go up is probably good!

https://fediverse.observer/stats&months=50
Total users are huge now.
There are many websites out there that pull data from the fediverse. So take that with a grain of salt. But anecdotally I am seeing a small rise in people using the various platforms as each get more mature and servers somewhat stabilize.
I think it would benefit from growing - the volume of content & discussion it just too small to support niche topics. If you want to talk about things other than the top ~30 topics, you will be waiting days for any form of response.