That is it, having additional source of income makes one remain balance in terms of expenses or over expenditure within the period of investment, when having multiple stream of income it reduces tension and the fear to temper their investment without getting to the stage of maturity.
People fails to understand the fact that before they go into whatever investment or even savings they should have another means that would also increase their chances of not touching their money, just like bitcoin at this point when we are experiencing a bull trend isn't something one should temper due to lack and want it reduces profits .
It can be said that when they have other sources of income, at least expenses will be balanced between investments and your needs during the month because there is no more severe strain because they have adjusted from other income.
Yes, it is better to increase income opportunities first rather than investing directly with mediocre money, then it will not be in line and end up breaking up halfway because the money used is not sufficient for investment anymore, while by increasing income sources we can more freely set up investment plans and emergency funds, there is no greater tension because income has been increased so it is more sufficient to start investing.