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
He admitted it he was wrong at the end of the ticket and fixed accordingly: https://github.com/LemmyNet/lemmy-ui/issues/2384#issuecomment-1978857727