When we can see a chance to buy the coin when it's drop, then that will be a good decision. We can prepare by buying the coin and then we can hope that it will increase later. That is why we need to select the potential coin in the market because we see there are too many coins that could be one of the profitable coins in the future. Buying the coin in the dip will be a great way for us to get the coin at a low price, so we don't have to worry if the price does not increase for a long time.
just a hope? don't use it as a foundation for you to buy coins when you go down. use your analysis that will help you to find the best assets for investment. now all coin prices are down and cheap. Will you buy it all? of course not, choose the best.
Good decisions don't come just because we see opportunities. Good decisions are based on sound reasoning and in depth research and a basic understanding that more times than not if you do the direction you choose, you will be right. It is STILL not a 100% guarantee that it is going to lead to the right decision! Good is not necessarily right!