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
No matter all said and done we do and still will have greedy traders around the world, it's going post you are putting up and this should give most newbies clues on how to enter and exit the market when it is time.