Who's telling you to?
Crypto should only be money that you can afford to lose , just like your poker bankroll and as part of an overall investment strategy where you mix high risk medium risk and low risk investments and the crypto is part of the high risk investment part of your portfolio.

To say there is nothing backing up crypto shows a complete lack of any understanding of where crypto is heading . It will eventually be the basis of the financial system along with many other features based on its decentralized security. It like telling people back in the 80s/90s that the internet will be at the heart of the economy in 20-30 years time. Without the internet now , much of the economy would have ground to a halt instead of people continuing to do their work from home.