A post from 2 days ago presented a graph that showed an important variation in the active userbase: https://discuss.tchncs.de/post/52565659
Using the daily rather than monthly view on https://lemmy.fediverse.observer/dailystats&days=120 shows a much stable line (especially if you take into account Piefed's growth: https://piefed.fediverse.observer/dailystats&days=120 )
Going through the comments in the other posts, a few recommendations that can help with the overall experience
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use different feeds: either using different Lemmy/Mbin accounts (one account per type of content), or Piefed personal feeds, but being able to browse different feeds such as "Good news", "Hobbies", "Art", "Life advice" help to see more content than politics and tech
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discover communities: subscribe to !communitypromo@lemmy.ca, !fedigrow@lemmy.zip and !newcommunities@lemmy.world to add active communities to your feeds
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go to general communities rather than specific ones: the current user base only allows so much specialization. Your favorite city builder community may not exist, but !citybuilders@sh.itjust.works does. !stationery@lemmy.world and !pen_and_paper@lemmy.world may be inactive, but !journaling@sh.itjust.works is not.
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use a client that allows for comments consolidation: I don't remember which mobile apps does it (Sync, I think?), Piefed has that feature built-in too. It allows to see all comments on a cross-post in the same view: https://piefed.zip/c/privacy/p/928874/worst-in-show-ces-products-include-ai-refrigerators-ai-companions-and-ai-doorbells#post_replies
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report toxic users and avoid communities that do not handle your reports: quite a few comments mentioned that issue in the other thread. Mods can't see everything, reporting helps to keep the atmosphere of a community enjoyable.
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use a client that implements keyword filters: quite a few mobile apps and alternative Lemmy front-ends do, Piefed has it built in. It can really help avoid the "doom and gloom" overwhelming your feed.
Finally, a few communities recommendations for lighthearted communities
Is a line really the shortest distance between two points if I can fold the paper and punch a pencil through it?
SHUT UP! STOP THAT RIGHT NOW!
Too late, I already had the first interdimensional handshake.
On my way to space-time 6 now. That's 3 dimensions of space and 3 dimensions of time. Now I am all.
String theory says that there are up to 11 so... so there!
It's still the shortest distance between two points, but your example makes "distance" ambiguous, so the answer depends on what definition you end up using.