For me, am not yet a trader, but read and have a little knowledge about trading. So, for the little coins I have, I sell it when there is a little rise or when I need it in cash. To every trader, they sell when there is a rise in the price of the coin they hold.
for small coins grabs drop or growth of 5% to buy and sell. This is how you can make money on the difference in price. But if we talk about Bitcoin, then the real price was 11,000 dollars to sell, and you can buy when it falls. She'll fall. That's for sure.