for me the factor behind the bitcoin rise is the legality of this coin if countries allow bitcoin in the Africa Asia and Europe fully allow bitcoin the price will boom and bitcoin will rise at record level.
The factors that primarily make bitcoin rise is the increase in demand. And this can't be actually realized if adopters and investors will decrease. If many businesses will accept bitcoin and used as a way of payment, demands will get high in the market. And with limited supply of bitcoin, the price will then rise up continuously.