Unpopular opinions get super-duper downvoted here but don’t “disappear” as often as on Reddit (not including rule-breaking submissions).
I enjoy talking with the local and Lemmyverse regulars and also with most users. Reddit is so big you get lost in the 10000 comments, however many bots are copying top comments from a past repost you wouldn’t know. Lemmy is a good size now, if anything it should grow out instead of up (revitalizing more niche communities).
Topic niches served well by Lemmy: Linux, being upset at capitalism, Startrek, LBGTQ-friendly crowds on blahaj and beehaw, pcgaming, buying local and quality products (there are fewer suggestions but your average reply is better in quality than Reddit), Woodworking, DIY offgrid living (solarpunk), and a bunch more.
When I was on reddit, I got into a habit at some point of replying to standalone comments with just a handful of votes to start conversations and make people feel seen. It appears I’ve still retained that.