There are some great communities of obsessive hobbyists here like !Selfhosted@lemmy.world, and if you throw a brick in any direction you’ll hit two Linux nerds, but reddit has /r/sysadmin and other infosec groups that have large numbers of industry professionals - and no amount of enthusiasm can substitute for real-world experience. I miss the conversation from people who spend time writing system security plans, reading NIST documentation for guidance, thinking about remote management for networks that support thousands of end users, and who have to actually deal with the cybersecurity incidents that get reported in the news.

I think Polandball has never really taken off here, same with Lego :/

Investment or stock communities.

Personally I’m boring and just invest in broad market indices, but I still enjoyed the discussions.

There is a Saudi community on Lemmy as it just popped up in my feed.

r/collapse

Full of the most pessimistic possible interpretation of climate change events and news possible.

It’s here too, but quite dead.

One for my model of car. One for native plants in my area

3d communities like blender, vfx were active, I was getting back into webdesign (for local businesses freelancing) so wordpress was interesting (for the drama not helpful lol), comicbooks was wayyy more active there (I stopped reading when reddit permabanned me, i liked discussing with the ppl reccomending me stuff), fantasy for books, all the drug related ones, rave related ones, nootropics, supplements, etc. Adhd and adhdmemes there was good, thats okay here.

Bit on the niche side but some relating to posting cute animal pics or some more hyper specific niche ones for some games. I actually run a few on Lemmy but real life issues alongside less activity overall means I’m lookin for some mods on that end.

Crazyfuckingvideos (especially since I was one of the first posters there), Reeftank, Bookcirclejerk, Playboicarti, Gardening, Photography

• Niche committees for random movies, TV shows, games, or whatever form of entertainment. It was pretty cool having communities for The Crow, Hellraiser, iZombie, Xena, Due South (who here even knows Due South?) and basically just whatever the hell you can think of. Even specific bands, to throw music into the entertainment mix.

• Fashion based communities like Alt Fashion, Goth Fashion etc. I think communities like that would thrive here because NSFW is kept pretty much separate from most instances, so it would help keep away the porn brain commenters and OnlyFans bots. Also things like hair and skincare style communities. You could find really niche shit like even communities for advice specific to hooded eyes.

• Feminist slanted communities with active discussion. There are a couple of communities where probably the moderators are keeping the lights on by posting articles occasionally but beyond that, they’re ghost towns. I’m honestly surprised that more people from these sorts of online communities haven’t come here yet because Reddit in general likes to “both sides” this kind of conversation. While it seems generally more acceptable here to get off the fucking fence and walk around on the left hand side.

Tbf, most I use especially since I started ignoring news and politics… Chinese, Buddhism, art, yoga, poetry etc. Local city subreddit. Everything “humanities” is sparsely populated here even though I try my best to get the ball rolling. I still use reddit for some of this.

every single sub for media/franchises i’m a fan of and 3d software

None of the Japanese communities actually migrated over (for those living here, such as the finance one), which is sad. I’m still hoping they eventually do. Until then, unless law and taxes become much easier (try doing legalese in your non-native language that has thousands of characters and tons of Jargon), I still go there for that. Same with ALTTPR, unless it has some community I haven’t seen yet.

There was a sub i think called r/daily3d that offered a daily prompt for users to create in 3d modeling software like blender. It became inactive years ago when the moderator who offered the prompts stepped down and set up a bot to come up with it instead. It was never huge, usually 10 entries a day at its peak, but that was a fun sub to check in on every so often. Some users were really good, and before the bot took over, the mod offered prompts that encouraged user interpretation and creativity.

There’s my list the communities I miss and it’s not even a full list. Majority of them don’t exist on the threadiverse but there are some that do but the problem there is that pretty much everything is dead/stale.

And countless other art and niche communities.