I agree that there is a lack of feedback, but I don't think it's specific to this community. I've discussed this with people I know in this fandom and in others and there seems to be a downtrend in comment culture in general.

But! More people posting fanwork here would be a good thing. It's nice to have variety in the kind of posts a community gets.

Prompt-based fests of the kind that surstrommiakki is would probably be difficult to run here (they're a lot of work, I've run that kind of thing before and it's hard), but themed months sound like they might be a good idea.