How can I make my college application look more appealing?

You're off to a good start—running a small business by yourself is one of the strongest things you can put on an application, honestly no matter what the subject you'll be studying is. It would be cool if you could connect it to your future goals, but even if not, the skills and responsibility you need to put into running a business are going to reflect well on your ability to commit to something as time-consuming and difficult as becoming a surgeon. So to start, in your application, I'd focus on those aspects of it.

Otherwise, it's hard to find anything that will give you a great look at a minimal time commitment, because time commitment (along with leadership) are some of the main things colleges will directly consider when assessing your application. Activities at less than an hour per week aren't typically things colleges will view super highly. That said, you'll have 10 spots to fill on your application for extracurriculars, and only being able to fill two of them also tends to reflect negatively. Considering your grades, the easiest one might be honor societies like NHS and the subject ones (English, Spanish, Art, etc.), because those reflect pretty well on students but don't usually require a huge time commitment unless you're in a leadership position. Also, if you're thinking of becoming a surgeon, community service or volunteer work of some kind would fit pretty well into that—you could do that independently when you have time and summarize those efforts in your Activities List.