I know a lot of people who quitted their day job to trade in the cryptocurrency market.
But it was when the market was good.
In this bear market, they're struggling very hard to survive.
So I think the best way to invest is this :
Have a side job, cut down your expenses, then invest 10-20% of your monthly income in the market.This way you never have to worry about gain and loss and surely you have higher chance of getting rich because the market will recover in the long run!
I think that if a person wants to be a trader, then first of all, it is necessary to get the appropriate knowledge and skills. And for this you need to learn a lot of information and constantly practice. If these conditions are well met, the trader will be able to earn in any market, be it bullish or bearish.
Of course, if your friends earned only because of luck, then it was very unwise for them to give up their main job. In this case, they should have first mastered the trading skills.