He just needs to be creative.

Write a book
Get your name on a toaster
Be the face of a food or drink product
Do a motorvational speaking tour
Do after dinner speaking
Go into training other fighters
Acting

And that's just off the top of my head. There's no need to get back in the ring there are loads of avenues for him to go down with the name that he has.

And remember, Dana White will always take him.....