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
Oh no my public posts aren’t deleted from every instance I guess I should have thought a bit before I posted something PUBLICLY.
Anything you post ‘publicly’ is online somewhere forever. Deal with it or stop posting