Hey there bud,
You will obviously grow some more,since you are only a freshman,so let nature take its course first and foremost
Id work on getting your throwing arm stronger.Do rotator cuff exercises and things like that(stretch bands are great and you can do these every night). Long toss is good too. Another thing to work on is your footwork. Jump rope,latter drills,etc are good for this.It will help you a lot with throw downs and pitches you have to move around for. The difference between a 2.2 and 2.0 isnt always arm strength,but footwork. Make sure you are firing out towards the bag at second base,and not falling off to the sides,or putting all the weight on the back leg of your body
Get in the weightroom and get stronger. Down the road you will have to pass an eye test at a camp,and you want to look like an athlete,but also play like one when you get the chance. Its better to not load up the weights to the point where it nearly breaks your form.Rather,put on a weight which you challenge yourself at,but still move the barbell and dumbbell at a quick speed.This way you develop explosiveness,and not just bulk up like a body builder. Stay consistent in the weight room,and dont skip workout days
I wouldnt worry about showcases until later next year. Work on getting your game better,and improving your defensive ability. When you are hitting,swing hard and dont cheat yourself. College coaches love batspeed,and so do drills to improve your batspeed.
Also dont forget,stretch VERY well before games and practices,and workouts too. You will be happy down the road. Take it from me. Dont forget to eat fairly well too.