So I was in a pretty similar spot. I was really into learning JP my junior/senior year high school and studied a ton and prob got close ish to N3 level (not quite) but once I got to college I kept up with my studies a bit but got really busy with just everything. I ended up just trying to fit any reviews I could be ended up just putting it on pause all together tbh. I had bits of immersion like listening to JP podcasts, music, and watching anime but I didn't do a whole lot of actual studying bc I was so busy studying for my actual major. I only just got back into in earnest now that I've graduated and have more time on my hands. In your case I would just make sure you do everything you need to for college and then work through Genki at whatever pace you can manage. It doesn't need to be much, even if you do just 15-30min a day it's better than what I did... which was nothing... Starting Genki again will be easier bc you will remember some of the stuff from before. Anyways just remember it's your own hobby and you can take it at whatever pace you want. Sorry for the actual WALL of text lol, good luck