Study a reasonable amount. Make good flashcards[1] and incorporate memorization into your routine.
Try things out. Literally anything. Sports, music, arts, tech. It is so much easier to try out a wide range of things in college.
Find time to reflect. No one here can give you a blueprint for a good life so take some time to think about all the things you are doing, your studies, the company you keep and if these align with your values.
Actually do things. Lots of people sit around talking about their big ideas. Only a small fraction actually do something. It's much easier to poke holes and criticize what other people have done and much harder to stick your neck out and do something.