Curate, connect, and discover
Obviously it'll be a lot easier to convince the Prime deities(unsure about Kord though) but let's consider SOME of the betrayer gods like Torog-
He can potentially finally have an existence free from the pain that his divinity brought him, and i think he'd choose to die permanently instead of being reincarnated from the fear of feeling it again.
Lolth could try and make amends with her children,she still somewhat cares, albeit in an obsessive controlling way.
Dunno why people even think about Tharizdun,it isn't a god,and both primes and betrayers fear and hate it.
Bane could lead a mighty empire,but as a mortal king
Asmodeus is too prideful to give up on the one thing that in his mind makes him so much better than the glorified meat puppets he calls mortals. He's too resentful,too caught up in his own pain to let go.
Tiamat and Zehir are uh....well Tiamat is still a giant ass five headed dragon whether she's a goddess or not, plus nobody likes Zehir.