I am dissatisfied with my iPhone 15 pro, want to trade it back in, but it’s well over 14 days, what to do?

I got an iPhone 15 pro back in December. I liked it at first but then after a while of having it I’ve become greatly dissatisfied with it. The battery life just isn’t as great, I don’t use any of the features I thought I would’ve, and overall I’m not enjoying this phone anymore. I wish I could get the normal 15 like I was originally going to. However it’s been well past 14 days and this phone isn’t paid off. I really wish I could just trade in/ buy the other 15. I just want to know what my options are for me.