this fits perfectly with a headcanon i had at the height of my s5 rage:
quentin actually tries to escape the underworld, over and over again. until everyone down there is so annoyed with him at not falling in line and making a fuss, that they show him the letter and the https://twitter.com/Fae_Boleyn/status/1264681048824320000

smashed glass bottle that used to hold a piece of his soul and basically tell him "look you wanna get back to your friends? this is what they did. they let you go. they have already given up on you. they threw away the chance to save you, they didn't even properly check

whether it would actually work to throw part of your soul in that well. so can you PLEASE just accept that you're dead and STAY dead?" and quentin is heartbroken and so angry. and so ashamed that he is heartbroken and angry because who does he think he is? why would he have

the right to demand that his friends resurrect him? who is he to hate them for giving up on him?
so he gives up on trying to get back.
and when rupert breaks the whole thing he walks out of the underworld (or gets dragged by penny40?) and he doesn't go back.

instead he goes somewhere else like maybe norway or scotland? somewhere beautiful where he can take long walk at the ocean while wearing a thick, warm coat.
and he finds a small coven that does beautiful magic and falls back in love with his own magic.
and he lives in a small

house somewhere green, takes hour long walks with his dog, meets his friends to do some magic a few times a week and lives a quiet life.

(listen... i want q to get his friends back, but the pod people of s5 are not his friends and they don't deserve him)