I run a few groups, like @fediversenews@venera.social, mostly on Friendica. It's okay, but Friendica resembles Facebook Groups more than Reddit. I also like the moderation options that Lemmy has.
Currently, I'm testing jerboa, which is an Android client for Lemmy. It's in alpha, has a few hiccups, but it's coming along nicely.
Personally, I hope the #RedditMigration spurs adoption of more Fediverse server software. And I hope Mastodon users continue to interact with Lemmy and Kbin.
All that said, as a mod of a Reddit community (r/Sizz) I somewhat regret giving Reddit all that content. They have nerve charging so much for API access!
Hopefully, we can build a better version of social media that focuses on protocols, not platforms.
I'm curious how well niche communities will work. It seems too niche here, like it's hard to find, hard to grow.
Like I do alternative keyboard layouts. If someone on Reddit wants to find it, it's rather easy and everyone in that community is there (there are dozens of us, dozens!). But on lemmy I think those dozens will be spread out more.
It will definitely is a hard to find hard to grow. So far federation and different instances might make redundant communities, but I think these will naturally tend to merge/go inactive in time.
This browser of communities https://browse.feddit.de/ is a godsend to find communities I may like. Though it's all centered in Lemmy and I want a similar tool for kbin (or this browser to add kbin instances communities).
You could just announce it on reddit and establish a community here. People follow content. A website has a pull, but it's much smaller than content itself.