Hey current plebe here!
Honestly, I think your profile speaks for itself. The GPA and SAT are in a great range, and the fact that you have demonstrated your leadership and athletic skills through student body positions and varsity level sports is key. Those numbers will place you in a good standing among your peers in the overall Cadet Candidate Score (CCS).
My SAT was a 1350, but as
@bt18 stated, try to take the ACT as well! I took the ACT twice and received a super-score of 34 (USMA super-scores!!), which I think greatly increased my chances...if you are into STEM, I would definitely recommend the ACT as the science portion was not too difficult and the math is easier.
Now, considering you stated that you have done 4 semesters of high school so far, you just finished your first semester of junior year correct? You still have plenty of time to add onto your resume! I think it would be important to try to become a team captain of one of those sports (whichever you enjoy most or are best at) and continue until the end of senior year (I understand it is hard with Covid right now but hopefully this will resolve soon!) just to show to USMA that you can be dedicated to that specific sport; they prefer solid dedication and leadership in one item than participation in several. Same with student body.
Let me know if I can answer any other questions! Good luck!