I think finding out what he feels makes him unique goes a long way. Children with emotional issues tend to not know how they fit into themselves comfortably which caused inner turmoil. So make time for just him no expectations and allow him to show you something about himself. Also let him make mistakes and HIM to think it through only offering help if asked which will strength the bond between him and you.

Hopefully a small spark starts a fire.

Just a opinion,
Corey