I’m worried about my friend

I’m in hs and my best friend went though a break up a couple months ago. He dated this girl for around 6 months, he clearly needs help. He’s lost weight, he doesn’t do his work anymore, he’s not eating or sleeping, he’s drinking, and he’s pushed all his friends including me away. He’s thrown himself into working and buying a car (I think he’s buying a car out of insecurity as his ex gf has one). His mom is aware and very worried about him as well. He very clearly needs a therapist l, teachers are worried about him even the administrators or the school are talking about him, he’s pushed me out if his life and I don’t really think there’s anything I can do but we have mutual friends who I’ve been encouraging to try to convince him to get help. What should I do?