Can a PC become a god / powerful celestial?

This recent question seemed to be received well (Can a PC become a Devil?), so I thought I’d ask this one which I’ve been wondering about for a while.

Is it possible for a PC to ascend to godhood? A few options I’ve explored is becoming immortal through one of a few means, and getting plane shift spell to go to the god plane.

Specifically, I’m looking to gain celestial like status, not change creature type.