Cryptocurrencies are and always will be volitile. But still, there is no reason for this day to day panick. We have had a fenomenal end to a year and we should all be happy(and hopefully a little richer, I know I am). Like everyone has already said, this just a mere price correction and I think it's a healthy thing for crypto. The market goes up and it goes down and there is no reason for crypto to be any different. My suggestion is dollar cost averaging and using this price drop to accumulate assets for the upcoming year, because 2018 will be an important year for us.
In the picture bellow I hope you will find reassurance, so as to not sell and lose out on the upcoming profits.
Thank you for the read, any feedback is welcome, enjoy the day !