Hey, I think I saw you post on that "how to get a bit more of positivity" conversation recently. I make a post there listing a bunch of communities that were not news, memes, or tech. And I realized that most of them were powered by a single person. So they'd often have a reasonable number of upvotes, and occasional discussion, but a single person would do all/most of the posting.
That's probably not a good thing. I mean, if a specific dozen people left lemmy, we'd be left with only news, memes, and tech communities. And you're talking about some of the pressures that can make these "community drivers" leave. I can think of a couple possible solutions:
help those community drivers to find backups or co-drivers
let people know that it's OK to just take over a dormant community and start posting