@Peter faith, I would like to tell you that, it doesn't matter whether you are a monthly salary earner or not, all you just need is any good means that could provide money for you on a daily, weekly or even monthly, but if you don't have any anything that would put funds, on your pocket then forget about it, you can't invest in Bitcoin, it doesn't matter if you are not getting funds monthly, like you said earlier, that you have a business which you are doing so far, and I believe businesses give little money daily even in a week (although it depends on the type of business), if the business is a good one, it can provide money for you, it is just for you to think on the amount that you could invest into Bitcoin that will not affect you after everything.

Investing is one of the most important things, but during the process of holding, you don't need to be in a rush. If you can only afford $5 weekly from your business after all expenses, it's good to invest with it, but lastly, I would like to say never invest with emergency funds, without you having emergency funds you can't hold for long.