Hey there!
A question of panic selling was already discussed on this forum a billion times. But whats bad here? If you are sure that the price will grow back then you can just buy some BTC in better rates. The more dangerous will be the situation when someone is buying BTC while being afraid of loosing some profits despite the fact that pump has already happened (I'm calling it a panic buying). Thats seems like a straight way to lose money and make a bubble.
I think its not bad even you bought bitcoin while the price is high but yes its more good if you buy bitcoin when it is low because you will gain more money /profit so i think we should need to do is think and don't get panic even its flactuating.