Remember, this whole thing about crypto is largely decentralized, thus, there is no single authoritative body in control of the crypto market. Although there are few centralized platforms among crypto, the market is largely influenced by the efforts and influence of the users of crypto. How well sellers and buyers treat the coins on the market affect the performance of the market.
The price and the actions are two different things. No one controls the circulation or transaction or actions etc... because it is decentralized but exchanges control the price of the cryptocurrencies. I mean sometimes they trade with big money to speculate or sometimes big player buy or sell their tokens or coins via exchanges. That's why Vitalik said " I definitely hope centralized exchanges go burn in hell"
in my opinion, there are a number of players with more or less events (for example, miners, holders, exchanges, even developers), but one of them may have more power than others in terms of improvements to the Bitcoin protocol technology that will be carried out. Which causes expensive or not the price of Bitcoin.