How do I make sure I use my Japanese while studying abroad?

Hi everyone, not 100% sure if this fits here but the r/japan directory said study abroad questions should go here. I am studying abroad in Japan for the upcoming spring semester through a program that works with KUIS. I’ll be living in a dorm, no option to do homestay. It’ll be one Japanese class and three classes taught in English. As for level, I don’t have any official certifications or anything but I took the N2 in December, results currently pending.

I want to make sure that I use my Japanese as much as possible. I’m not very outgoing and very bad at making friends, in 3 years of college I haven’t really made any friends. I’ve been trying to work on letting myself be interacted with and invited more and not turn everything down, but it’s a journey of course. What are some things I can do to make sure I don’t just stay in my room all the time?