Oof, I've always been fairly involved at school and I'm ngl I usually spend little time on Scioly throughout the year, but I really step up my game in the gap period between Regionals and State (when every activity sort of dies down).
Currently I have a leadership position in girls' tennis, Science National Honors Society, Science Olympiad, American Sign Language Club, and two nonprofit organizations.
Other activities that I'm heavily involved in include debate and club tennis.
Other activities that I'm involved in, but don't take up a lot of time are National Honors Society, Math National Honors Society, and dance.
While that may seem like a lot at first, the reality is that each activity takes up a lot of time-- but during different parts of the year. For example, when debate season starts ending around December, that's when the Scioly season starts heating up. Girls' tennis takes place in the fall, and I'm focusing less on club tennis as senior year comes. Other activities do take up a lot of my time, but again, the time of year when they're at their peak varies.
All in all, my activities are a bit much, but they truly don't take up an excessive amount of time. I still have time to hang out with friends and go to various school dances throughout the year!
EDIT: I forgot to mention that I held a part-time job throughout my junior year, I worked the entire summer last year (full-time job), and I will again work the entire summer (full-time job). You can do it too kids!