If you're already having huge capital for investment, maybe you can have that mindset losing what you can afford. Same with the friend of mine who quit his job, unfortunately the money he saved didn't prosper and eventually got burned in trading. Without proper knowledge on cryptocurrency trading, everything turned down and got vanished when trading without any concrete foundation of skills.
Apart from having to have a mindset that can be lost, basic knowledge that can guide us not to experience loss is a much more important thing to have. Because trading in the crypto market is indeed a little different from trading in the traditional market, the level of knowledge must be much greater for those in the crypto market in order to be better prepared to face market conditions and not easily experience losses. And your friend who has experienced a bad condition like that should not give up because he can still try again at another time to get back what he has lost in the past.