It's a cycle, dump and pump can really happen in btc, there's no need to panic. Since btc is still capable to pump soon like it did before. Same with it can lower the value but not as low as it is before.
if you have a plan to put your cash in bitcoin for long term then it is a clear case that you won't panic at all.
you never know right? global market like cryptocurrency will always work with that way , you have to completely understand about this and do analysis as frequent as possible. panic selling could be done when you have a lot of data and make a decision to take a cut loss action based on those data.