I'll echo what others have said about becoming a gym rat and taking advantage of every possible resource to get better.
That being said college baseball should not be on your radar. I would not consider a showcase.
Your goals should be tailored towards carving out a role on the team. Even if it's pinch running, defensive sub, inning eater, etc. Train hard in the offseason and work towards establishing a more "regular" role for your senior season.