Not to steal your thunder but the wefwef web app does this also, you just paste in your profile’s multireddit url and then it gives you a clickable list and each click searches Lemmy for all similar communities and then you can sub to any that you want.
Didn’t know that haha. My script does the same thing pretty much. Just automatically if that maybe is worth something. And I’m not after thunder, I made this mainly for myself (and to train coding) and if someone else finds it useful that’s great