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Bitcoin is not much different from investment products that are already circulating in the world, the cause of the price rising or falling is of course due to market demand. Bitcoin price may not go up and down because of the role of 1 person, the conclusion that drives the price of Bitcoin is all of us (buyers, HODLers, and sellers of Bitcoin)..
Btw, no one can control the market. You're right, that the key is demand. when demand increases, there is an increase in a positive trend, which means that the desire to buy bitcoin increases. this is what makes prices go up, in theory. In some cases, bitcoin price can be affected because a large number of BTC holders move their wallets, but I'm not really sure about that
indeed it is impossible for one or several people to move the price from bitcoin to a very high price level, this increase in bitcoin price is of course more and more people who want to buy and of course want to invest in it, because in the future more and more people believe that bitcoin can be used as alternative. someone invests and saves for a long time, the more demand and purchase of bitcoin, of course bitcoin will increase at a higher price, even if there will be a decline, of course some people want to sell some of their bitcoin assets at price when rises like now.