For those seeking out a federated and open alternative to Tumblr, Wafrn is looking extremely promising. It can speak both ActivityPub and AT Protocol, offers a ton of interesting features and customization, and focuses on making an incredibly fun experience.
I hope one day the Lemmy developers arrive at the idea that a person could be a community, somewhat like the way Mastodon treats communities as users. It’s a confusing generalisation, but it works.