Rather than focus on what's good for him, focus on what is good for you.
Shine a light on what you want for yourself, what you want in your life, framed in the positive, and think about how you can attract those types of people into your life.
It has been drilled into my head that I have no control over people, places or things, and the only control I have is how I act myself.
People cannot "save" addicts....they have to save themselves.
Action...consequence.....and a strong bottom line -that's what gets people sober.
Good luck....