You can go to the Campus Recreation Office (where you signed up) to quit your club whenever you want, there will just be a cooldown before you can join another. Idk if more clubs are planned, though.
Clubs (sports if) actually ends when/after each year/term from idk yet like each year depends as quickie job or riverside bar from age difference require except quitting in a same year and paying a new club after the first in same year as ik except i cant remember the next signing up for another different club in next year each time you do end it automated after stuff than manually.