Buy more or sell?

Most people are faced with this doubt. Obviously, the best time to buy is when the currency starts to fall, however, there is an instability of cryptocurrencies that makes it impossible to invest with so much risk. Some wait and hold on, but forget about the background. All this is happening because $BTC finally reached 100 and other currencies also reached the maximum. Usually, this causes a drop in their value due to the uncertainty of the markets.