About two years ago my friend lost his job. Since then he has been staying with his family, spending nearly all his time in his room doing drugs. Most of his social contact during this time was with me on discord a few minutes a day. During this time he started suffering from paranoid delusions that he exacerbated (and still does) by staying up for days on drug binges and have gotten progressively worse. He feels shame about this and that seems to be the catalyst for most of his delusions. 

Hes convinced some people constantly survey him and make fun of him through media and subliminal messages. Hes convinced every person who walks past him mockingly smirks at him and that every dog that barks is barking specifically at him. This enrages him to the point where he talks about punching someone which i am scared he might do at some point. He has started to literally turn rocks and check crevices to find hidden messages for him any time i manage to get him out of the house. He suspects every single thing of having malicious intentions and any person of shaming him in some way. Sometimes he talks about being chosen to bear the suffering of humanity and sometimes about having psychic powers. He does talk to professionals but i do not believe he tells them half the stuff he tells me. 

Im his closest friend and I just wanted to see if you guys had any advice on what i should do. Ive had a thousand conversations with him trying to break things down logically but its impossible to reason with when it comes to his delusions. I cant convince him to do less drugs or apply for a job spend any time doing anything healthy.

I try to validate his emotions and reassure him best i can while still trying to push him to make healthier choices. I dont want to put to much pressure on him but he just stays inside and does drugs and I feel like I have to try to motivate him to take some steps towards a healthier life. Im trying to find the balance between validating him and pushing him to do better. Any thoughts or tips from anyone with BPD or someone who also has a close on that suffers from it would be greatly appreciated