My tolerance is getting higher and I don’t know why

I used to drink a lot from the moment I turned 21 up to early 2023 and I would say I’m a lightweight (1 soju bottle is enough to get a good buzz going) but for the past six months I rarely if ever drank, I went from drinking every day to maybe once or twice every other month and recently I’ve started drinking again and I’ve noticed my tolerance became higher and I couldn’t even feel drunk from what I used to drink unless it was 3x or more the regular amount. Not worried or anything I’m just confused as to why my tolerance got higher, anyone here know why?