yes Rome was not build in a day, but It was not build with only one strategy just as you are concurring to what BITBAKKII is saying, same thing applies to BTC, accumulating large portion of BTC can't be possible with only one strategy, because with only one strategy you we surely be tempted to make a withdrawal when needs arise, to avoid this withdrawal when the needs arise you need other strategies like setting aside an emergency fund,because as a human being you have to feel the need of emergency,another strategy is having other sources of income and businesses and many more strategies, that is the only way that you can avoid being tempted to a withdrawal when the arise.
What matters the most are accumulating Bitcoin, reaching your accumulation target and holding for a longer period of time, the strategy you employ matters less, as long as you're not a newbie waiting only for the dip to purchase Bitcoin.
Some people have large discretionary income available that they lump sum and acquire good stash of BTC, possibly reaching their accumulation target or nearing it. If the person feels lump summing is better for him, then they should continue with the strategy that works best for them. DCA is for those who want to be buying periodically, consistently for a longer period. Some people do lump sum and DCA at the same time and it works for them, so whichever accumulation strategy that works for the investor is valid as long as they are purchasing Bitcoin without trading it and having a long-term holding period.
Whether you're using one accumulation strategy or more, if you're not disciplined enough to restrain from shaving off profits from your portfolio, you would engage in bad Bitcoin accumulation practices and ruin your investment.
Discipline is key in maintaining a healthy accumulation journey and not necessarily the accumulation strategy/strategies employed.