A fun Mastodon thing I don’t think people realise - you can interact with Reddit style services like Lemmy without leaving Mastodon as it’s part of the Fediverse.
Eg I follow the @starfield community by following that user, new posts automatically appear in Mastodon feed, I can upvote by favouriting, and I view and reply to comments in the thread.
I’ve never signed up for Lemmy, here’s me posting from Ivory app via Mastodon.
Only app I have found so far that comes close to this (outside of Mastodon) is Memmy. It works great and searches communities from instances that are federated. So far no serious complaints and I can’t wait to see where it goes!