I'm at the bottom fighting to get to the top?

I love football it's my passion I was doing fairly well the first two years I was playing then when I got injured( torn acl) things weren't the same. I couldn't do anything I could do before. I played WR catching mostly everything thrown at me now I can barely catch simple routes. I played DE and i was the best pass rusher now it seems as if my body is too slow for my mind. Then I tried out on the high school varsity team and I wasn't impressive at all but the coach said I can be great with practice. But them during a practice I tore my acl. Then the coach said don't quit be a manager and come out next year. I'm not fine with waiting I know what I'm capable of but I can't show it. I'm at the bottom trying to get back to the top?

What do I do?