The reason why some investors fail while using the DCA is improper planning because I see no reason why an investor that have engaged in a lot of investment strategies would not know that before choosing to DCA they need a stable atmosphere that will not deprive them of their continuous accumulation therefore having a reliable source of income and possibly alternative means should in a case where the principal source isn't coming forth again, they can eventually fall back to the alternative means to still continue forwarding the DCA.
You are right! Why should a man go to DCA if his income is not right. A person can think of keeping his money in a safe place only when he has a consistent income arrangement. And if he is sitting in the gallery waiting for the bull run to break his target after buying Bitcoin on DIP, then he is living in a fool's kingdom.
You should set a target of at least 4-10 years. And in between keep a target on DCA on weekly or monthly basis only then you can reach your destination