There are people buying and selling bitcoin, there are people investing in assets using bitcoin, bitcoin is already legal in a whole nation, bitcoin is being legislated in many countries, bitcoin is a legal asset in many countries, but perhaps the most important thing is that there are people using bitcoin and that generates something very valuable "trust", if you do not have it there is no problem it is easy to invest in something else.
I believe one simple logic to show that bitcoin has real value to other people is to show somebody that you are converting btc to your fiat currency. How can they not believe if btc has no value if they are actually seeing that btc has fiat value. It is understandable that some people are hesitant because they feel they will be holding an asset that can easily go away, which is true. They will be holding keys to their wallet and somehow for traditional users it is quite scary.
I really like the point you’ve put forward but as bitcoin is extremely volatile it’s value fluctuates a lot. Do you think such an asset can be good for investments?