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
Take those graphs with a grain of salt. There are several websites that track activity and all of them show different results. I also assume that almost every lemmy update affects these graphs, since things did break quite a few times.
This is from the official lemmy site join-lemmy. It says 820 Servers, 41k Active users
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This is from fedidb (same site the screenshot from the post comes from). 923 Servers, 39,832 Active Users and 433,819 Total Users
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Then we have fediverse.observer. Based on that graph, monthly active users are growing. 845 Servers and 43,631 Active users and 1,944,442 Total Users
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And finally we have lemmyverse. Which uses the method to find the "sus" servers and users, so 863 Servers and 1,741,848 Actual Users
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To me personally it seems like the content is becoming more regular and better in quality overall. ¯_(ツ)_/¯
Yeah of course, it depends on the method and lot of things. Anyway, I agree with you, I'm happy with the content and the spirit of the users (less trolls and haters than on reddit or commercial social networks, more like the internet users I knew late 90s or beginning 2000s).