While you are panicking over the decline in the price of bitcoin, the largest bitcoin holders will have an even more volume of bitcoins because of the panickers
Because of the falling down of value many of traderd or invedtor that didn't understand the falling down of value and those always monitoring the fluctuation of price was the cause of panic selling even they buy on the high amount until they panic and sell in the lowest amount so they didn't earn just because of their panicking attitude so until the value was dip invest and invest or buy and buy.