to me the price of bitcoin cannot fell down to the bottom line, as the position of bitcoin is now becoming more and more stronger as the time pass therefore it is now become difficult that the price of bitcoin will ever fell to such a lower level.
The price is already quite low if compare it to bitcoin's potential. So i no way would I say, stop investing in bitcoin or stop buying bitcoin for that manner.
Support at 600 dollar is strong which means the bottom is around that price.