Good to see you’re this focused at a young age.
Speed kills at the end of the day and if you don’t develop the speed further you’re not going to be competitive at the highest level in high school, let alone college or beyond. I think focusing on the 100/200 and then hopping into 400m races, whether the open or through a relay, will give you the best chance for success. i am not sure of your PRs, but without a doubt you’ll get the most from simply developing your speed and becoming more fit without pure lactic or special endurance work coming into play at all outside of meets. If you can’t run in at least the high 10s in the 100m, you’re not going to have a chance in most states for a 400m title, let alone much beyond that.
Try to do as much work on grass as you can. Work on developing speed and acceleration through 40-60m, get a healthy dose of lifting, tempo (which can go out as fast a 800m IMO and be fine), flexibility/mobility work, and you’ll be well on your way. I would consider even doing some sort of organized/semi-organized basketball/soccer/volleyball for some of your non-sprinting days. It will further develop you as an athlete and give you some things long term that purely running will not.
What does your current schedule look like? What is your facility situation like?