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
You should ask it on lemmygrad.ml :D
I mean, it would be one way to get them stuck chasing their own tail on an endless task…