Its not bad to sell your holdings after all because that's what we called cut loss but if you think this dump is just temporary then better not to make any action or just keep on investing. We can't say when the market rise high again but you have to make yourself more confident about cryptocurrency, this is our future that's for sure.
That is true that would depends on the person on how he is going to handle the things. In my case if I have space enough and I can handle it well I will keep buying and if I am in need I will sell it for the exact usage of the bitcoin. It is better to keep investing until the money will getting bigger.