Find out why it was rejected. Usually, it comes down to the price that you offerred to buy the home, but there could be other reasons for rejecting an offer:, such as: the amount of down payment you were willing to put down, the financing, the closing date, etc. Open a dialogue with the seller through your real estate broker or directly, if that's how you are operating. Good Luck!
As far as options, take into consideration the feedback you receive, and consider making a more suitable offer.