Interesting baseball situation?

Ok this is interesting so lets see if you follow. In my Junior year of High School I was the top reliever for my team. Over the summer I improved on my hitting and put myself into a good position to start at first base in my senior year along with maintaining my relief spot. Problem is I tore my ACL, MCL, and meniscus in the final football game of the year. Somehow I was able to make it back not too far into the season. I struggled immensely on the mound except in a few spots and it took a while for my hitting to get going. I always though of myself to have some kind of a shot to play at the next level but the injury kinda just let that all p. I am now in college and was considering to try and play again. I was thinking of playing legion ball (yes I am eligible) and the possibly trying to walk on in the fall. How to I go on achieving this? I know I have to train but how? Do I talk to the head coach at my school and ask him if there is a way to train through the program? Or is there another effective way? I feel like it is worth a shot and maybe if I could return to my previous form I could possibly make the team. First base and pitcher is what I could play. Should I also focus on just pitching (thats what I'm better at) or do I give myself more options and do both?