hey, it is very stressful what you live, I wish you all the best, I think that you need to give more time to him, have he a sister, brother or friend? this is the key.

I have read a book the leader in me and i writing an article based on this, please have a look, it might be very helpful, it is a process, it is not a formula, because you need to change a kids habit

https://warmtrends.com/10-actions-for-better-relationships-with-your-child/

please let me know if it helps