What can I do to raise my chances of getting in?

I’m a freshman in high school and I get A’s in all my classes except for one, which I have a C in. (It’s Health like wow how do you have a C in health).
Anyways, My GPA would be a 3.9 or so without the Health grade, but it was because of one test so I think I can raise my grade.
I know CMU doesn’t count freshman grades, but how can I really make myself stand out?
Female
Asian
SAT score- (from 7th grade ok) 1650
I live around CMU and can probably visit the college a lot and I do Speech and Debate and Varsity Tennis as extracurriculars. What can i do to raise my chances god help me