I have not heard about this bullish accumulation of a thing and it is sounding like being passionate to accumulate Bitcoin against all odds. I hope I'm wrong but the right way to invest in Bitcoin is always with discretionary income to avoid a situation where you will have to sell Bitcoin to meet your basic needs, which is not a good thing to do. Even though you may not have meet your accumulation goal in terms of the quantity of Bitcoin in your portfolio, it will be better to imbibe consistency than to rush the process since with time you will definitely meet the target. In other words, the concept of slow and steady wins the race.
If you are accumulating Bitcoins and want to hold them for long term then best approach is to accumulate them through discretionary income. While your job salary or business income can be used to meet daily requirements. Why discretionary income is important is because it allows to dormant your Bitcoin for longer duration. Without discretionary income or if you are accumulating bitcoins with your salary then you might cash out your bitcoin in the long run, which completely destroys your plan of long term investment.
Please don't complicate things, we don't accumulate Bitcoin through discretionary income rather we accumulate Bitcoin using the DCA method or approach and discretionary income is just used for buying Bitcoin it is not necessarily an approach. And there is no approach an investor will decide to use that won't help or make them hold for long term provided they are capable and have the capacity but the DCA method is just an approach that help both rich and poor to accumulate Bitcoin and it is very convenient because you can buy or accumulate at any point of the market.