In my opinion, the best time to sell is when the market price of the coin is 20%+ higher than the market price at which you bought the coin. Dont wait till the market price is 95%+ before you sell. That only happens when you got your eyes glues to your machine 24/7. Dont be greedy... Make a little profit and grow it over time. Cryptomarket is growing and full of terror! Be careful
There is a way to get it, if you have an Exchange that allows you to put Stop Loss and Take Profit at the same time, you can place the percentage you want to win and that's it.
Now if the trader is greedy is a harmful feature, because you will always want to win more and more, and a failure will make you completely lose the horizon, many traders that happens, and their disappointment is so great that they do not make more trading.
It's amazing how to see trading with greed and have in mind get rich quick can make many mistakes, one way to avoid this is to take profit and divide the outputs, that is, take 40% at a level of price, another 30% at another price level and another final 30% if it reaches another price level, this is to lengthen the profits, just like Jesse Livermore did.