I want to suggest !main , or !chatter (general topic discussion that’s been kind of inactive), !general, and other just general chat communities across servers that aren’t memes and shitposts, just to give people a low bar of entry to talk about how they feel, what’s going on in their lives (to the extent they wish to share).
Someone looking for general advice, share something cool that isn’t yet part of any community (but it could help start one), ask a question that they feel isn’t a good fit for asklemmy, newbs and forum veterans can talk about their experiences. I think it can foster contributions from power-posters, occasional posters, commentors and lurkers alike and grow the Lemmyverse organically.