Congratulations on your achievements so far.
I also would advise you to go deeper in what you are already doing (EC #1/2/5), rather than add more ECs, but I do like the podcast idea.
Are you thinking of playing tennis in college? If so, what is your sense of what level of school/program you would be targeting? Recruiting kicks off this month for your age group. You should be contacting coaches via an email introduction now.
Do you have any budget constraints for college?
As an international student you will be at a disadvantage in college admissions, so I agree with those who say to make sure you have at least one likely admission school that is affordable. Are you applying to any ex-US colleges? I would rely on your HS counselor to help you build a good (balanced) list of schools.
Lastly, upon college graduation it will be quite difficult for you to stay in the US to work longer than the OPT time (and who knows if OPT will even exist when you graduate.) I would encourage you to be strategic about what you major in; you don’t need to major in ‘business’ to work in business. Currently, some STEM majors like math, to take one example, offer pathways into business, and have longer OPT times than finance because STEM majors qualify for a 24 month OPT extension. https://www.ice.gov/doclib/sevis/pdf/stemList2024.pdf