While i don't follow Phil's antics for years now i have so in the past and was aware of him long before i knew of KF (making fun of DSP was an old /v/ staple) and honestly, i don't think therapy, going outside, whatever normie stuff you can think of that could help somewhat normal people just wouldn't work on Phil. Phil just doesn't seem like he's much "there", he does his usual Pigroach shit that he has been doing for years and will do so for years to come, neither feeling happy nor sad about it but nonetheless doing these things, incapable of change nor introspection. I am not even sure DSP truly registers that other people beside him exist, despite having lived with Khet for quite some time and before that with PandaLee.
I am also sure he would go crazy if he was ever forced to go cold turkey from electronics/any form of media distraction and be alone with his thoughts for five minutes.
Sounds a lot more armchair-y than i planned but this is honestly how i see him and his sad existence.