Bitcoin, according to the white paper is a peer to peer payment method. It serves as money with no third party or central body involved. Currently, it hasn't fully meant the criteria of money due to certain limitations but it has helped one become their own Bank. Not to mention, Created more uses than satoshi anticipated.
OP, Bitcoin has fulfilled so many purposes for which it was created, and it has also fulfilled the purpose that was not mentioned when it was created, and that purpose is Bitcoin as a means of investment. Bitcoin as a peer-to-peer transaction process without third-party involvement is what I have used Bitcoin for and am still doing. I have paid different kinds of people in Bitcoin, and that's a peer-to-peer transaction. I have also bought and paid for something in Bitcoin, and that's still p2p. So what more has Bitcoin not fulfilled? Bitcoin is not centralized; you don't need the authority of anyone to withdraw and deposit some bitcoin into your wallet.
Bitcoin has made some people millionaires and billionaires today because they bought it at an early stage and held it until the price skyrocketed. Bitcoin is a store of value, and the value and price increase over time, and that's why people invest in it. Our currencies (local currencies) are losing value, and Bitcoin has become a cool asset to invest in because the value of our investment will always appreciate during the bull season of Bitcoin. It's not a bad idea at all.