Some people are saying that date of ban is coming near in India and thus all Indian investors are selling. This has caused decrease in price.
Actually there's so many reason why the market price decrease and also that one of the reason why, but i think the reason is when the bad news release even its a fake news and many people sold their token because they follow what the others people do especially who people don't have enough knowledge about crypto market.
The manipulation of the big whales one of the reason why bitcoin falls down,they are spreading false news to be afraid those people who holding bitcoins and they sell it in a lower price even they are losing their profit,and because of the big supply of bitcoin in the market this is the reason of bitcoin huge price drops.