The truth is that there would always be a wave that would spur one to buy or sell a coin. The success story comes when one is able to discern whether to go with the trend or not. In this space, whatever goes up will surely come down, so if you feel you've lost out on a trade, it's best to wait for the value to drop before making a purchase, Inorder to prevent one from making losses.
Do not get it twisted, a wave should not prompt you to enter to buy or sell any token.
When it comes to crypto currency investment, it means you have studied the token growth over a long while waiting for the right opportunity to enter the trade.