I'd like to see people talk in a wide variety of communities. I've been trying to post to !malefashionadvice, and there are a handful of people upvoting there, but the only other posts are super basic questions once in a blue moon. Most posts don't get commented on, and most comments are empty one liners about how nobody should enjoy X type of clothing, rather than anything positive or engaging. I haven't found another fashion community half as active as that.
There doesn't seem to be a Jewish community here... the television community I've found is kind of active, but not really... The NYC community sees maybe one post per week...
It seems like there are plenty of niches going entirely untouched. I feel like people are less likely to discuss hobbies here unless those hobbies are focused on "nerd culture," software, etc. Most communities are just memes or something. !asklemmy seems to be 30% askreddit-type questions, 30% questions about fediverse, and 40% are like, "hey, how do you fix a broken air conditioner" or, you know... non-discussion questions, non-opinion questions, non-story questions, just "help me with this shit" or stuff you could look up in an encyclopedia.
!foodporn seems to be pretty good...