The DCA method is not for only those with stead cashflow as I have been made to know by JayJuanGee when someone ask the question in early part of the thread. In his response, even though your cashflow is not regular, you can still figure out a way to invest using the DCA method and that can only require you taking average of how often you receive inflow and then make projections from there. You can be in a type of business that pays at least once in a quarter. You can do your calculations from there by first calculating what your basic needs would be for the quarter, then removing the amount for investment and even emergency funds and some reserve funds.
I totally agree here. Dollar cost averaging is not for those who receives salaries as that is what most persons think is income. Our income can come from any means. It could be that we are a worker that receive wages, or we are into freelancing, and if we have a business that gives us profits. Even those that go about doing side hustles that may vary from time to time the nature of job they are into. As long as they get their income at the end of the day, and from it they can allocate some percentage of their discretionary income into their investment.
Once you have a source of earning you can invest through DCA in Bitcoin. It doesn't matter if your pay day is weekly, monthly, or can vary based on the nature of job you do. Just focus on the key which is accumulating consistency not instead of focusing where the money comes from.