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
As soon as Sublinks is live I will.
Lemmy is making the same mistake as Reddit, and they’ll be an exodus when we have an alternative
https://piefed.social/ is more promising, and almost there except mobile apps. Feel free to try it out.