How do I maintain my knowledge in ASL?

I'm a senior in high school and currently in ASL 4 but the college I'm going to doesn't have asl classes or major/minor but I really like learning it and I want to be proficient but it's really hard to keep up practice with a language that I can't really use frequently because I don't have any Deaf/hoh friends to talk with and I don't want to go up and talk to random people that I see signing... I'm probably going to join a club but what about after college? I want to retain it my whole life