Welcome, Joysphep. My son is 28 and also mentally ill. He has several times gotten himself hospitalized or in Residential Treatment to avoid being homeless. He has been homeless. He does not want to be so again.
I echo everybody else: how strong you are. The only motivation to change will come from his own experience, which involves suffering for everybody. Nobody does not suffer in one way or another.
I am glad you are here with us. I hope you keep posting. I think your relationship with your son will grow stronger as you stay strong. The only way strength comes is to have to dig down in oneself to find it. We find it because we face challenges. That is what you are insisting that your son do. He needs to do this to be a man. I admire you.