Doomsday is remembered primarily for Killing Superman, unfortunately, that's not something he can do every time he shows up. Since he keeps coming back, how would you utilize him?

I have two ideas

The first idea is to make him not a Superman villain. Make him a villain for the broader DC Universe. I imagine you can get more mileage out of other heroes having to face down the guy that killed freaking Superman than trotting him out every so often for a fist fight.

My second idea is based on the idea that Superman, at his core, does two things. He saves people, and he beats the bad guys. Doomsday, from his inception, was a character that Superman cannot beat. As such, what if Doomsday was a bad guy that Superman had to save. A tragic monster who is trapped in a hell beyond their control, and Superman can stop him by giving him relief from his pain