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)_/¯