His lack of motivation might involve depression. Has he seen someone to rule that out?
We (hubby and I) wrote a contract for stepson and one we stick by.
1. curfew
2. No drinking/No Using
3. Must work
4. Enroll in classes
5. Keep room picked up
6. Laundry once a week
7. Money is managed by all of us together
If he breaks #1 or #2 he must move out immediately.
I will send a prayer your way because I know where you are coming from.
Glenda