I often lose my temper when altcoins drop sharply.
And in general, I sell altscoin at the bottom
Keep holding, you should set a target that you want to achieve when you bought the coin, and a reasonable target based on the research that you've done not some moon target. If you have a target then you'll stick to it because you know that coin will reach the target, you can also buy more to reduce the average cost of your coin if you really believe it will become a successful project. Also don't forget to set a stop limit incase something go wrong.
Lol for your kind, the best way would be to not peek at the market. Everyone would tell you to hold hold hold and that's basically the most logical.thing to do it such situations