Answer:
Wether being around people or himself makes him more comfortable, watching a movie, going on a run, he could even write an E-mail knowing that his sister will eventually read it just to be able to let it out, he could take a shower or clean, read a book, distract himself with something productive, he could find a new job maybe that one wasn’t meant to be but he’ll definitely find another one that he loves, or stare at the stars and remind himself that everything happens for a reason and that he’ll be okay not today or tomorrow but eventually. Everyone is different and dose different things they do when they need to take care of their mental health, we can only give suggestions but he’s the only one who will know what he really needs or what will help him.