This is because the price of bitcoin is not rising from a very long time now and the users are not able to earn profits.The investors are suffering from losses because of the downfall of price and therefore they are pulling their money back from bitcoin.
Very long time?
Dude, the price was $900 per coin just one and half year back. If people can wait for 5 or even 10 years to get their returns from equity, real estate or bullion, what prevents them from being patient with their BTC holdings?