I would suggest putting a “filter” on your computer. My computers have k-9 protection on it. I’ts very good and you can choose what you want to be done on your computer and what you want a password on.
Also, i would try and focus on things that SHOULDN’T be done before the things that SHOULD be done.
For example: Don’t push him go to school, learn or daven before he stops with the music or movies or being michalel shabbos. Cuz it won’t happen that way.
If he doesn’t like talking to adults, have him speak with people his age. But don’t tell him they are gona help him…
Maybe he would like to play/help with a little kid. Or take care of someone’s pet…
I think the first step, if possible, would be to get him away from his harmful friends and find some better ones.
Good luck!