It's obvious your friend are a trader.

Becoming a trader not require a huge amount of money, but living by just solely depend on Bitcoin investment will require huge amount of money.

It's risky to invest in one asset, but I did that and after 5 years, it doesn't look risky. But, you can't solely live by depend on Bitcoin, your active income is the most important thing. So, try to make your active income higher instead of thinking about investment.