I’m Trapped In Car Loan Hell

Hi! I live in Ohio. I have a 2019 Nissan Sentra that I pay $301/month on that I got back in 2020 at a used car lot. When I got the car, I was a moron and signed the loan with my then fiancé and put him on the registration as well, even though my bank account was used to set up autopay and I’ve been the only one making payments since. Flash forward to September 2023 and he cheated on me to run away and join a polycule in Florida. Now I have this car that I don’t want anymore but since my ex is MIA and out of state, my hands are bound in red tape. The title bureau had me get a PoA filled out and notarized claiming that would be enough to remove his name from the registration so I can sell it to Carvana, but after getting the PoA the BMV told me I have to refinance the car to do anything. So I look on credit karma, find an offer with ‘outstanding’ approval odds, and after submitting an application they say they can’t help me. What do I do now?? This has been eating me up and I’m so confused. I was 21 when I got the car and too stupid to think farther ahead than what I was having for dinner. I’m older now and see the error of my choices, please help me.