The best reason here is that, bitcoin's price depends on the demand and supply thing. The higher the demand, higher price, low supply, high price.

Just think of it, bitcoin is predicted to pump to $10000 so there will be a lot of people who will be buying bitcoin and hold it in until the pump, that means the demand is increasing proportional to the price. That means that if we can see the price continuing to increase day by day, it means the demand is pretty high and a lot of money is being put down into bitcoin.