Kanye, how about just being yourself and playing your game. Often, when a player tried to impress some coach, just the opposite happens. For example, you might want to put a little more pop on that ball resulting in more balls out of the zone. A pitcher that doesn't have control doesn't have anything. When you enter that game, it isn't about you regardless of who is in the stands. It is always about team. Coaches notice those things. So, be a good teammate. Do what you do which obviously gets you on the field. Show that you know when to cover 1st base and hustle. If you do this then you've done all you can do. Good Luck!
Outstanding advice and what else would we expect from the Coach!
For a rising senior, your velocity is fine and rarely seen at the high school level. Show that coach you are a winner, a team first guy, and can win with the tools you presently have. Show him those things and he might think "I can see that kid fitting into our program. If we add some weight training and teach him a pitch or two, I could see that kid pitching on Friday nights down the road."
Give him a chance to like YOU first and foremost. As the coach so correctly said, be yourself and let the chips fall where they may. There is no one else exactly like you. Be that guy and do not try to be someone else who you think the coach "might" be looking for. He very well may be looking for someone just like you.