We should not get panic and at that stage we should try to buy as many coins as possible by taking an advantage of price dip so that it can give us an opportunity to accumulate more number of coins at lower price and sell them when price goes higher in future.
For the bitcoin, when there is panic selling and the price drop a lot, I will buy more and have made some profits since.
There is a lot of whale that just waiting for the big dump so that they can bag more of it. There is no need to panic selling if you are just a small volume order because they are many backup out there that willing to support bitcoin. Don't treat bitcoin as regular cryto currency out there that has a very volatile price.
Many can not make the right decision. Especially beginners. They quickly succumb to panic. And they often make this mistake and sell bitcoins at a low price