It greatly depends on your capabilities ,but i would advice you to have many stream of income ,most especially when you are more focused on increasing your profit
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I completely agree with you that it is not ideal for anyone to have just one source of income as it can make that person to be living from hand to mouth instead of being able to live comfortably, so it is very important that everyone should have a multiple streams of income so as to live comfortably and be able to cater for their needs.Whatever you do, do not have a single source of income, it is risky. It is said that the average millionaire has about 5 sources of income. So try to have other investments that will bring in more income for you. The more the merrier.