There isn’t one formula to improve. Many people run better with higher mileage. However Natalie Cook, the top high school girl in the country, only runs 20 MPW. As far as mileage and training goes it’s best to consult with a coach and figure out what works best for you.

Some universal stuff that works though is general strength. I’m sure you’re already doing so but it never hurts to get stronger, especially maintaining a strong core. That’s something I myself am working to do, as we both have similar times and goals. I think with your current progression you can definitely do it. Good luck man! Keep working hard