I coached, with much team success, until age 12. By then son was in high demand, and I traveled too much to make the travel team committment. That first travel team, Birmingham (MO) Jaguars still has more that 10x players still playing some college sport in their senior year. With his last tournament team (18U), I did extensive moneyball/sabremetrics analysis, and we finished 5th at a USSSA World Series in Jupiter with some marginal talent.
But mostly we just worked out. We threw the ball all the time. I fungoed a zillion ground balls. We talked about the inner game (a lot) and we hit endlessly in our garage cage. (Actually he hit and I tossed.) Oh yeah, as mentioned elsewhere in here, we shot and used a lot of game and cage video to refine the swing.
And......... I must mention, HaverMom was deep in there every inch of the way.