By the end of 2017 the total marketcap reached more than $ 700 billion, but the total marketcap at the end of 2018 dropped to around $ 90 billion, the biggest factor that made the market drop was the number of scam projects so investors would rather sell than buy.
At that moment negative news from china and others government make market panic, they trying to banned all crypto access and transaction /and it followed by fud that continuesly spreaded whales so all investors sell their assets.and i am sure now this fud and negative news slowly moved from market.