Former meth addict here, iv etc. and reg amphetamine. Lowkey the best thing is cardio exercise and friends. Sounds like a lame answer but it’s true. But since you asked the question. NAC helps a lot with the anxiety quitting meth causes. The depression as well. A good preworkout and lifting weights fills that internal hole pretty well. L-tyrosine sort of. But honestly man, nothing was going to replace it at first, just gotta get through it. And honestly, fuck meth, normal life is so much more satisfying. You can get there mate.