What would Fang Yuan do after achieving his goal?

Let's say he does it and achieves his concept of immortality - ageless, invincible, and all-powerful. What then? I honestly cannot imagine him picking up any hobbies, and finding a wife seems even more unrealistic. I think he would probably just try to find ways to get even stronger anyway, since he obviously enjoys the journey itself. At his core, he's a cultivation addict.