If you look at the stats for the Class of 2025 - there were 16K + applications started - there were only about 6,300 total nominated - and I am sure some nominated were not medically, physically (CFA), or academically qualified - if you have a nomination and are fully qualified your chances are much better to get one of those 1,300-1,400 offers of appointment than being one of the 16K that began applications. Each step in the process takes you closer to an offer of appointment. Once you are found to be fully qualified and have a nomination, it is all about stacking candidates up against each other - GPA, SAT / ACT scores, recommendations, CFA, as well as demographics, leadership, athletics, etc.
After you complete the application, get a nomination, and are qualified medically you have done all that you can do. You just have to hope it is enough to put you above the line and receive an offer of appointment but lots of other highly qualified individuals are thinking the same thing. Good luck, thanks for your willingness to serve! Concentrate on a strong finish to your senior year and always have a “plan B” ready if the academy falls through.