As you wrote, we must have a main income besides investing in crypto, this is true because the crypto market is very volatile as we see. So if we have a job in the real world, it remains a priority because our living needs and family must always be met. I read a member's comment that said crypto is other income. I agree with this because we must have a fixed income from the real world.
Well, I think this depends heavily on each investor's ability and preference. Usually, we invest in crypto to diversify our portfolios, and we still focus on our main jobs in real life to generate fiat. However, we also have full-time traders and 100% of their income comes from crypto.
What's more important is that crypto has given us another opportunity to invest and make money with just experience, the internet, and a device with trading software. Crypto trading is even easier and faster than stock trading, operates 24/7, and everyone is welcome to participate.