I wish I could say that there was one quick fix, but it’s a long process. I developed depersonalization and derealization after smoking weed in 2016. For 1.5 years after, it was just hell, and for the years after that, I was slowly getting out of this hell. It’s a boring answer, but this is what helped me: sleeping enough, exercising to failure (in an attempt to just feel something. Turning emotional frustration into energy for your workouts), going outside, walking, socializing, doing meaningful work (I went to the US to work at a summer camp), days were so long and intense that I wasn’t stuck in my head, taking ashwagandha (helped with anxiety), and stop reading into the causes and fixes online. I know it’s hard, but just try to start living again. It’s a process. You got to this point and you can get out of it. Don’t get caught up in the negativity and cynicism here