It is never mandatory that you must have a strong source of income before you can start up Investing in bitcoin but you can gradually grow up your bitcoin portfolio with your little source of income provided you have your discretionary income ready, having a strong source of income to me sounds like your income Flow must be huge before one can start accumulating Bitcoin meanwhile you can be accumulating Bitcoin with the little income you are earning or making every weeks or months using the DCA strategy and then grow more your source of income over time.
What I like about bitcoin investment is that their is no minimum amount that you can use to invest in bitcoin, even if you have a low sources of income, then you can still
Invest in bitcoin, just that you might not be able to invest so much in bitcoin, but you also going to be holding some bitcoin which is better than you not holding anything. You can just start small, then with time you can keep on accumulating more bitcoin, you shouldn’t wait till you have big amount of money before you invest in bitcoin. Just make sure you plan yourself, and if their is any way which you can increase your sources of income, then that’s better, but also don’t starve yourself just because you want to invest in bitcoin.