I agree with you and would like to say that if Bitcoin remains stable in one place, that is, it neither decreases nor increases, then Bitcoin traders and Bitcoin traders will lose interest in it. Because traders will not get dividends from it.
Again, if new investors buy more Bitcoin, then the price of Bitcoin will increase, and if many people sell at once, then the price of Bitcoin will decrease. If Bitcoin is not unstable, then its new investors will not be attracted. In that case, Bitcoin will lose its momentum.
That's why we can still buy BTC on the market

And while it's that way, it will always fluctuate, albeit more or less depending on the current sentiment and the value it already has (which only increases, and the fluctuations - decrease).