I was one of those who championed this multiple sources of income but along the line, I realized how defective that could be because it create a case of "Jack of all trades, master of none". If you are poised to getting multiple streams of income, chances are high that you will end of splitting your time and resources into tiny segments that may not produce the much desired results. I remember when I was still thinking this way, I was contemplating mining, buying shitcoins in their ICO and hoping they pump, investing in shares and also trying out stocks. That was how I spread my funds into different areas and end up losing most of the funds because what I was doing was sheer trial and error.
Instead of the quest to invest here and there, I think getting a solid business in the physical sector and investing in Bitcoin in the digital space is just enough. This will give you the time and opportunity to do it well and perfect the business. Part of the proceeds from the business can be invested into Bitcoin and saved for the future. For those working paid job, they can attached just one other physical investment to their job so they remain afloat always instead of spreading their money to anything they see in the guise of multiple streams of income.
If your mind is so determined about opening too many streams of income, you will end up investing in many things that you will lose your money because there will not be enough time to study the business well and perform all the necessary risk analysis.
Another angle is that sometimes we also should be investing into ourselves in ways that would potentially cause us to work smarter rather than working harder and also we might be able to increase our income by being able to get higher paying jobs by investing into ourselves (such as training, education and/or getting experiences that might not pay well in early years, but have greater potential to pay off higher at later times down the road).
Sometimes this is the mistake of some people thinking that there's an easy way on everything and they just need to learn the basic then everything will work for them instantly. But they forget to realize that everything change that's why their learnings towards each situation or condition is important so that they can adapt on those changes and make sure that they didn't left behind. Especially right now where technology is fast evolving being knowledgeable person and adaptive is important so that they can survive and still gaining profit with new things introduce to them.
If people just have patience and have this attitude that hungry for new information or ideas then provably that everything will pays off with them in long run.