It seems like you have participated in some ECs, but I am not getting any sense of cohesion from them. What are you passionate about? How do your ECs/volunteering tie together to define you as a unique person? If I were an admissions counselor, I’m not sure I would remember your application among thousands. I think that if you can resolve this issue then you definitely have a decent shot at USC.
Also, regarding the issues faced due to moving around: make sure you explain these things in your essays. From what I hear, it sounds like they played a significant role in your high school experience. Try to think about what you learned from these experiences and how they made you a stronger person.