jointhefediverse.net seems to be a commonly linked resource for directing people to join the Fediverse.
Curiously, it does not list Lemmy under the list of Reddit alternatives. Their GitHub README explains why.
Previous relevant discussion: https://lemmy.ml/post/78808
Well, at least pens don’t have a proprietary algorithm by said nazi to make it not function when you want to write something that is not nazi propaganda, unlike things like Twitter, where the far-right is being boosted.