Be camly accept your losses and be optimistic to the future. Just hold you r coins until it reaches your desired prices or value. I think you have always a backup plan if you invest in the cryptocurrency. Dont lose your money only in one ICO or cryptocurrency. Always check to the successful cryptocurrency to have a good investment.
It is important to accept what already happened, and just keep moving forward. After a loss, you should consider your mistakes from now on, and avoid the things that led you to your tragic moment. Just move on, even though it might take a while.