I also work 3x12s and mostly love having the 4 days off. The downside is being able to do virtually nothing on those days besides eat and sleep. I think one advantage of the 9-5 week is being able to still do a few things more often. It’s hard to practice hobbies and maintain the house with gaps on days that I’m working.
What you value changes slightly as time goes on. Having the more consistent day might be more appealing now. And if you dont like it, there are always nurse jobs that are in need. Maybe there is something in between the hospital and that gig, like dialysis nursing. Worth a try.