Fiat and gold are fixed? Gold is very volatile. Fiat values change all the time compared to other fiat.
But I don't try to convince anyone, that is not my role. I do like the underlying technology and once you understand that, then your eyes are opened.
For many years I didn't participate in the cryptocurrency market because I thought the same. But then companies - corporations have started to think how they could benefit from blockchain technology. That happened in my sector. So I started to investigate about blockchain, understood what a blockchain is. Read Bitcoin whitepaper. And started to see the potential.
Then I started to invest in cryptocurrencies.