I really don't know why? I mean will we ever see $800 again... I doubt it for some reason
Bitcoin's price depends on the perception of the people. If enough people consider bitcoin as a good storage of value, it might hype immensely and we will see $800 or even $1000 again in near future. But if they think instead "better live now and spend everything" BTC will go down, too.
Bitcoin CAN NOT be a good storage of value, because the PoW mining expense is way too high. By holding Bitcoin, you are basically charged a 10% tax each year. That's not a good storage of value. Bitcoin can become a good storage value if it converts to a Proof of Stake network.