Having multiple sources of income is good but when there isn't stability of the outcome of income or wages at the end of the day, there is sure to be poverty and lack of financial power.
Therefore, do you think that a source of income must be steady enough for years, before one can be financially free or rich or very wealthy, depending on the source(s) of income?
Your thinking is a little more confusing because actually rich people must have a much more stable source of income that makes them financially strong. Wealth also varies from one person to another so to say how much money you have to be classified as rich is also difficult to translate with certainty. Lack of financial strength also does not necessarily make someone fall into the category of poor because poverty should be interpreted as if they are unable to meet living needs.
I don't have a reference to wealth because it is difficult to translate and maybe the difference between poor and rich people is only in the process of making money and the richer someone is, the greater the expenses they need so the value of financial stability will also be different.