What can I do about this deadbeat ex spouse?

My ex and I have 50/50 child custody. I have been divorced 3 plus years. I have had my son 95% due to his lay off and then he rented his house to others. He cant have our son at his place now (elderly condo) and refuses to get his own place to live and have a home for his child. He says he can’t afford it. He has a new job and I know he makes good money. I need to know how I can proceed to make him take his child more than 1 night a week and be a father to his child.