I would sell my coin when prices again up more than the purchase price. The price has dropped significantly, currently, so I am not selling anything for now.
Usually, I sell my coin exchange Idex +kucoin + etherdelta + livecoin etc.
That's the right thing to do, do not be greedy when you have the opportunity to sell with a profit.
Being greedy will not gonna give us good result in the future, that is because the market is very unpredictable, it does not guarantee success.