!bicycles@lemmy.ca isn’t super-high volume, but it’s definitely not inactive. It gets a post every other day or so, and there’s discussion on those posts.
I feel like the real problem is where there aren’t enough people to even have a conversation. Once you’ve got people there, then just posting more isn’t that hard.
Not really dealing with your question, but:
Have you seen the video game Carrier Command 2?
Also, on !imageai@sh.itjust.works, I remember having two discussions. One was kicked off by someone generating polyganal-style art:
https://lemmy.today/post/2866942
And then I decided to try my hand at some slightly-similar stuff (probably less what you’re looking for):
https://sh.itjust.works/comment/5337207