How could I improve my application?

It is too early to know if you would be competitive. The SAT/ACT test, as well as your class rank are a huge part of your WCS and you don’t have those listed, yet. Getting those key leadership roles is where you should focus your effort. They really want depth, and leadership, in extracurriculars. Your gender, race, where you live and how competitive the district is, all determine how competitive you really are. Obviously, you can’t control most of those. But what you can control are your grades, your test score and where you choose to spend your time. Keep working hard on those things.