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
Fair point, but at this time, I’m on mastodon.social and lemmy.world, i.e. some of the largest instances. I simply don’t have much motivation to migrate.