Let the admissions rep with whom you already have a nice cordial relationship with know that you are disappointed, but still hopeful. Ask them if they have any suggestions on how you can better your chances. Perhaps you have won an award, made an honor roll, performed in a play since you applied? Add those activities to your application by sending the information to your admission rep so they can add it to your file. Write another essay explaining how you would benefit the college by being accepted. Do what you can do, then just cross your fingers. And if you do not clear or get in, don't worry about it. Happily go to your next favorite college. They will be happy to have you.