There were the time-sucks like r/amitheasshole that I loved, but what I really miss is the practical every-day subs where people shared valuable information. I am really into vegetable gardening, mechanical keyboards, and a few other hobbies and it was great to go to those subs and ask questions or get information. Vegetable gardening was particularly helpful in the last month so I am really missing it! Also, I was really active in a sub for people with type 1 diabetes and that was a huge resource in my life. Really missing that one.
I've seen a mechanical keyboard community on Lemmy quite a few times while browsing All. You should be able to search for it. I also found a couple gardening communities by searching "garden". They definitely aren't the same (yet?) But hopefully they'll get there.
That’s my hope. The biggest hurdle is getting a fully functioning mobile app. Mastodon has done great but that’s partly because there’s great mobile apps. If the same happened with Lemmy, it would really help.