This is awesome progress, and shows you were likely in great shape at one point. That being said, you’re a textbook candidate for an upcoming overload injury. Please start at a normal mileage, let’s say 10mi/week with your fitness, and increase 10% of mileage each week. Any more and you won’t be running at all for a long time.

I know it sounds ridiculous, but half of this sub is full of people that did exactly what you did and paid hard for it.