1 tire wore faster than the rest. What should I do?

Long story short, I was naive at first and didn’t check my tire pressure after they were installed. A year or so later, I finally checked it and realized one was higher than the rest. For this reason, it has worn down in the middle much more than the others (2 of them are fine, the last one is about in between the rest with tread life).

So my question is, what should I do if/when my tire doesn’t pass inspection? It’s a 33x12.50x15 BFG KO2, so I would probably have trouble finding a used equivalent and the new ones run about $180. I definitely plan on buying new wheels/tires in the future but I think it’s too early at this point since I’m in the middle of college and would rather save money. Any suggestions are appreciated.