HODL while you can...there's a lot of FUD lately and some negative news about bitcoin that trigger the dip. Some are just temporary but takes a lot of time before going normal depending on the dip. Though still volatile bitcoin already established itself. For me dip means opportunity to buy more in my portfolio. Bitcoin and alts investment is a risk after all if you don't risk you wont profit.
HODL is not always a good thing to do depending on what or why it's price go dumping like that so it's better we research why it happened like that and depend our judgement on the situation. But as recent news about bitcoin, there are still no news that will not make us hold for it since they are major enough for us to sell it out.