how to take advantage of the fact that im a teenager?

im aware that as a teenager i have a lot of time, with very little consequences when taking risks as I don't have to worry about money, a partner, children, etc.
currently workout 3x a week, crochet, read the bible, play competitive volleyball, im attempting to learn web design & japanese (a bit inconsistently), go for walks every day, get 8 hrs of sleep, and eat healthy, though often times i will have free time (especially during the summer) to do nothing. I would have gotten a summer job or volunteer position but I applied too late and they had already hired other students, I'll likely try again next year. I feel like the majority of things that I do are temporary activities that wont contribute much to my future, so I would like to know what to do with my time right now that will allow me to be more successful. thank you for any advice!