3 year old neutered American Curl cat

I recently bought this cat from a lady that I got my cat from 3 years ago thinking he was lonely and wanted a friend but my cat is only interested in fighting. He has a cute little nub tail that he likes to flick around when he's feeling feisty and he's polydactyl so he has big mitts for paws. I dont know much about him but I did get him caught up on shots and neutered. He is very sweet but nervous and has taken the last month to warm up but still seems unsure of the changes around him. If you're unfamiliar with this breed, a lot of people call them doglike because of how loyal they are and how much they love being with their people. I really fell inlove with this breed when I got my cat and Im very sad this isn't working out because I was so excited to have another one in the house but my poor cat is ready for him to leave his domain.

Im asking $300 for him considering I did just pay $200 in vet bills getting him neutered on top of what I actually paid for him but would be willing to negotiate for a good home!!