OP, where are you located? If you are in Moco. The team at Prepare for Performance in Rockville does a great job working with team sport athletes on getting them faster and more explosive. They assess the athletes monthly as well.

I would follow your high school’s track and cross-country coach team summer training plans.

I would look a Peak Performance speed and agility. They are in Tysons. I am sure there is something similar in MD/DC.

Running coaches are hard to find and probably not what you need.

https://www.peakperformancetraining-sean.com/programs

15 year old field hockey player looking for a coach to help her w sprint speed - form, training routines, etc. Any suggestions? Any former sprinters out there?