What if you are waiting for a DIP and you have a DIP target before you start accumulating and at the end of the day your DIP target is not met and if your DIP target takes so long before it approaches don't you think you might have tampered or exhaust the money you wanted to use and invest during the DIP?
Investing in the DCA method will invest in dips and pumping in the Bitcoin market, so if you invest regularly it will definitely control the average price. Investing in Bitcoin and DCA method is most popular as it has very low probability of loss, saving on both sides. It will save you the most if you buy regular dips, but the bitcoin market doesn't dip all the time so regular DCA method investing is the best method.
Even if you must accumulate aggressively that should be after you have DCA and a DIP happens but let it not be that you are just focused on waiting for a DIP before you start accumulating aggressively as you said. Cash inflow is not a prerequisite to owning a huge portfolio, you can literally start with any disposable amount you have in your custody and accumulation begins immediately.
In the case of Bitcoin, the more Bitcoins you accumulate in the DCA method, the larger the portfolio will continue to grow. Because this is the only DCA method applicable to anyone, because it can be dumping the market if they buy bitcoins at once. But if you follow the rules and keep investing in the DCA method over and over again, that's how the portfolio will continue to grow.