Agreed, it is necessary to mention that crypto trading might be a dangerous move, as the income from trading is never stable due to fluctuation of fluctuations. This is why having a main job is important because at least we will have an assured form of income and should there be issues of losses in trading then it will not be so detrimental as it would be if it were one’s only source of income.
Then what if crypto is just their place to make money.
I myself have been in crypto for 4 full years and my income is even greater than my real job a few years ago.
It's about how to take advantage of every opportunity, not just trading or investing, any job in crypto can provide good advice as long as you can be consistent and you can work on it.
In addition, to maintain a portfolio and increase income, investing and trading will be another job aimed at growing the portfolio.
So not only trading, holding Bitcoin, but crypto can be broader than that and can make more money with some of the skills you have.