So I’m a little confused here: you are already appealing before you have even been given a decision?
Generally, appeals work when an error has been conducted in the paperwork, on the part of your high school, community college or the University. Writing an appeal because you really, really, really want to go to USC, and it’s your dream school, is not going to work. In essence you’re telling them that they’re wrong and made a mistake in not admitting you. They’ve had years of experience with creating their classes.
My sister graduated from USC and what we learned from her is that it’s all about fit. You have to fit that university’s need for certain students with certain talents-musicians for band and creative artists. They really like hooked candidates- like legacies, URM’s, celebrity kids and, most definitely, recruited athletes.
It’s a very very expensive university and, given the pandemic, they’re probably not going to offer a lot in scholarships.
Just wait until your decision comes out. If you get in then you’ve gotten in if you don’t get in then you have other options.
Edited to add: My son was admitted, and was an eventual National Merit winner. He also happened to be an athlete. His best friend’s sister was also admitted; she also was a high NM scorer and also was an athlete.
My sister’s talents were flags (band), perfect math SAT, and URM.