There are still Lemmy users who go to reddit and reddit users who are exploring alternatives.

Onboarding onto Lemmy isn't the best experience and a lot of existing redditors are already afraid of change and don't want to learn a new thing.

I don't know if there is a website dedicated to making it easier for folks to jump ship but I can say that the amount of content on Lemmy now is much higher than it was when I joined.