In as much as the DCA accumulating strategy is the best among all accumulating strategy to acquire a huge stash of Bitcoin over a long period of time, it's not the only way that guarantees success as you are making it looks like, the lumps sum strategy is also there, the most important thing is holding very strong for a very long time. Why the DCA accumulating strategy is mostly recommended is that it has the most flexibility among all accumulating strategy because you will have to buy once your discretionary income is available on your own term, and as a low or average income earner, you can invest easily, but it's not a guarantee to be a success if you are not thinking long term.
Although they are saying that the DCA strategy is not the only way that guarantees success in Bitcoin investments, but all know is that the DCA method has overthrown the other strategies; that’s why a lot of people prefer to use it over any other strategy. Because if we look at it even in terms of accumulating the Bitcoin, it is easier and also saves money.
The only thing that anyone who have interested in the bitcoin investment or accumulating bitcoins for a long period of time needs to have is what you stated earlier, which is sources of income, because if a person has any other means of earning, they enjoy accumulating bitcoin more by using the DAC method.