Whales usually... Price will stay high unless they got bored and when they do, it will be a bloodbath. They keep the price high and make us wanna buy so they can dump their coins:)
thats true, bitcoin price is usually controlled by the people who have either a lot of fiat or a lot of bitcoins it is kinda bad thing because in this way it becomes centralized
It is like in a company where the stockholders with the huge number of stocks will normally control the company, in bitcoins the major holders or the whales can dictate the price when there is a big demand of bitcoin.