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
Yeah, but it’s guilt by association. Think about how X is now. Its owner is an asshole, and that hurts the platform regardless of how many cool people use it.