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.

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.

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.

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

Writing prompts. It's here, but it's unpopulated. Tbf the Reddit one wasn't super populated either, but that's where I did a lot of my reading.

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.

You prompted me to go through and check what I was subscribed to on Reddit, so here goes:

Rubik's cubes

• r/anarchycubing
• r/CubeModding
• r/cubepics
• r/Cubers
• r/Cubinggore
• r/NewCubes
• r/twistypuzzles

!cubers@lemmy.world exists, but it is pretty small, and there isn't really a meme culture associated with it. Rubik's cubes are very visual hobby, so perhaps this is being hampered by image hosting costs/restrictions? Personally, since I can't post photos straight from my camera, so I haven't bothered to post any images.

Spaceflight

• r/AstraSpace
• r/DreamChaser
• r/fireflyspace
• r/JAXA
• r/NeutronDevelopment
• r/RelativitySpace
• r/RocketLab
• r/SierraNevadaCorp
• r/spacex
• r/SpaceXLounge
• r/StarshipDevelopment
• r/StokeSpace
• r/ula

For now, I think these topics can be adequately served by !spaceflight@sh.itjust.works, !spacex@sh.itjust.works, and !rocketlab@lemmy.nz.

• r/rocketlabmasterrace
• r/ShittySpaceXIdeas
• r/SpaceXMasterrace
• r/SueOrigin
• r/TEATEBMasterrace

We do have !spaceflightmemes@sh.itjust.works, but I'm keeping it on "life support" with Reddit content. I wish the Lemmy spaceflight userbase was large enough to support its own meme culture.

CGP Grey, Brady Haran, and Hello Internet podcast

• r/Bestagons
• r/bradyharanexplosions
• r/Flaggyflag
• r/HelloInternet
• r/HItrivia
• r/nailandgear
• r/PodcastPostcards
• r/T_HIP

I've made !hellointernet@feddit.uk, but things have been pretty slow. It doesn't help that the podcast hasn't uploaded in five years XD

@grant@toast.ooo has made a nice home for !cgpgrey@toast.ooo. (Psst, it's time to swap out the pinned Cortex thread for the latest episode :)

Tesla

• r/TeslaAutonomy
• r/teslacanada
• r/teslamotors

I think these are adequately served by !teslamotors@lemmy.zip and !avs@futurology.today. (Thanks @BrikoX@lemmy.zip and @sabreW4K3@lazysoci.al)

Lesser Musk Empire

• r/BoringCompany
• r/Neuralink

I've made !boringcompany@sh.itjust.works, but haven't had the time to grow it. For Neuralink, might a more general community for brain computer interfaces be viable on Lemmy? I'm thinking something like !bci@futurology.today.

Board games

• r/Carcassonne

We had !carcassonne@feddit.de, but no replacement was created when feddit.de went down. Any instance recommendations?

Futuristic tech

• r/deextinction
• r/fusion
• r/ITER
• r/wheresthebeef

!fusion@lemmy.ml and !fusionenergy@lemmy.ml exist, but they are pretty dead and I'd rather move off of ml where possible. I couldn't find anything for deextinction or cultured meat.

@Lugh@futurology.today, any interest in growing communities for these on futurology.today?

Harry Potter

HarryPotteronHBO

Closest thing is probably !leaky_cauldron@diagonlemmy.social, but it is also being kept on life support with Reddit content.

Miscellaneous

• r/JellyBelly

Nothing whatsoever for this.

• r/JoeyForReddit

Somehow, my favourite 3rd-party app still works on my phone. I don't know how, and I'm not going to ask questions. I am sad that u/codesForLiving hasn't made a Lemmy app. Anyone know what they're doing now or how to contact them?

• r/legoRockets

If the casual spaceflight and Lego userbase of Lemmy could be grown, this community would arise naturally :)

• r/Penderwicks

!penderwicks@literature.cafe would be the obvious choice, I just haven't gotten around to creating it yet.

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.

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

• 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.

r/morbidquestions. I don't think it's coming here any time soon as it's a moderation hell and lemmy doesn't seem very into morbid stuff.

I miss tankporn, there aren't enough images of vehicles that can kill me in my Lemmy feed.

Lemmy is very poor in gay communities. There are some, but very inactive.

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.

I miss there being a lot more Swedes around in the Swedish community. There's >100k+ on Reddit, !sweden@lemmy.world has far less active users and a large chunk of the posts are from me.

• SlayTheSpire
• Permaculture
• NativePlantGardening
• StableDiffusion

Niche communities, of course