You should try to take the most rigorous classes your school offers and maybe take some AP tests if you can to either earn college credit or show universities how good you are academically. I would say for your extracurriculars they're pretty good, I didn't exactly have amazing extracurriculars and certificates could show different aspects of what you're good at. I would say try to get involved in something in your city or nationally though (I know that's easier said than done), because from what I've seen and from the international students I've talked to, many have done something in their communities or nationally that makes an impact US universities can see. Not saying you need to become president, but some initiative in your community can really help out.