It is probably due to a number of people stopping using their alts after some instance hopping.
Also a few people who came to see how it was, and weren’t attracted enough to become regular visitors.
Curious to see at which number we’ll stabilize.
Next peak will probably happen after either major features release (e.g. exhaustive mod tools allowing reluctant communities to move from Reddit) or the next Reddit fuck up (e.g. removing old.reddit)
Stats on each server: https://lemmy.fediverse.observer/list
Tags would be so good for Lemmy actually. Instead of creating new extremely specialized community we could use tags to help those who want this kind of content find it in a less focused community, preventing segregation of small Lemmy user base. And when certain tag gets enough traction we would create a community for it.
Instead we have sorting mechanisms that actively punish small communities and big communities mostly driven by news (e.g. c/technology).