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I don't have much technical idea on trading but as far as I know, it is really hard to predict the bitcoin price and you will never know the movement of the price. However, traders should know this since they enter in crypto space and it always has risk if you don't know to execute.
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Not only is it not easy to predict the Bitcoin price, it is impossible. This is true not only for Bitcoin but for any other asset traded in the market, whether stocks, bonds or precious metals. If you could even come close to predicting the price of anything, the market would either be destroyed immediately or you would be infinitely rich.
But what is certainly more serious in the case of Bitcoin are the manipulations that are carried out quite openly. Bitcoin hodlers from the early days can influence the market with, say, 10,000 BTC and lead to selling pressure, which these people then use to buy cheaply. Of course, this is also the case in other markets, but it is much less obvious, since the market supervisory authorities would immediately get wind of it and initiate sanctions.