If he’s a four-year old or younger, I’d just give it time. Trying to do anything even minutely like MDMA therapy would be massive overkill. Four-year-olds are n

If he’s a four-year old or younger, I’d just give it time. Trying to do anything even minutely like MDMA therapy would be massive overkill. Four-year-olds are narcissists just getting used to cooperative play with other kids. Show that you take your responsibility as a step parent as a duty, even if he says he hates you (the best reaction to that is to unemotionally and calmly make it clear your parental role is unconditional, e.g. ‘ok, but i’m still your stepdad and i love you.’) Or: ‘ok, you feel how you feel but it’s still my job to help you brush your teeth.’ Give him low pressure opportunities to do things with you, don’t force anything that isn’t necessary. Don’t expect too much right now, you are likely connected to some trauma in his life, and no four year old likes to be forced to do anything. If he’s younger than four, it all applies doubly.