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?
Sometimes, getting rich comes with fate. If you happen to win from lottery with its jackpot prize, then definitely you end up an instant millionaire. Now you don't need steady sources of income to make it happen because luck provides it for you.
However, if you are talking about small sources of income but with different sources, that won't probably make you rich, but will make your life comfortable to live and avoid getting into debt.