Good coaching is having a plan day 1 that has been developed over time with thought and effort Going to clinics and talking to older/experienced coaches that have been there and done that. Most coaches are happy to share knowledge, especially when it comes to fundamental. Have practice plans in place, concepts for each player to learn, actually have a couple base offensive sets to run vs Man, to run vs Zone, to break a press, out of bounds plays ect... Not rely on what your best couple of kids learned over the summer on the travel circuit.
It means recruiting assistant coaches and JV coaches that understand fundamentals and can develop your young guys who may not have been blessed with the resources or desire to travel the area to their own camps ect..
Just because you can't coach out of season, doesn't mean you can't learn as a coach out of season. Some of these guys, especially at Public schools are just there for a check and take up space.
Get them in the weight room and on a strength program, pretty sure you can have those as long as no sport specific training is going on.
It's a commitment to help young people achieve their goals, and if you are blessed to have a couple of college prospects in your feeder program don't cry about them choicing out. Build a foundation that they want to be a part of.
Maybe that's asking too much, but if you aren't ready to give that kind of effort into your program please don't cry about needed to split this state into 3 divisions so that your kids have a chance at the Bob.