There are many reasons why Bitcoin has always been an investment choice, namely transparency and security and the absence of third parties.
One can make a payment with Bitcoins and agree on a price range of BTC that they set, P2P is an example, at this time maybe the price is going down, but some investors can hold it or sell it at the price they want, we can see how many Bitcoins are being traded in the crypto market, more Bitcoins are stored in the wallet