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What you say is quite correct, in fact I have been doing it for the last 1 year by stacking with DCA. First of all, we have to be consistent in continuing to buy at maturity and don't worry about short-term price movements because that can doubt the decision. After we go through 10 stages of purchasing with dca, you will be more confident in continuing to buy because our confidence will grow in continuing to buy at each stage. I make purchases every 2 weeks and I only make two purchases a month.
However, there are also those who make purchases every week, but it all depends on the strategy they apply. Those who implemented DCA purchases in the last year were lucky enough to be able to buy BTC at a cheaper price of $20k at that time. The best thing is to buy and keep holding and don't sell all your BTC holdings if you are in an economic crisis, sell just a little and when your economy recovers you can budget back funds to continue buying BTC.
It doesn't matter how you do DCA either weekly or bi-weekly. The important thing is; You do it consistently as long as you have an income. The problem experienced by most people is the inconsistency of income which makes them unable to determine the investment period regularly. If you manage to set aside a budget of $50 a week, it's best to do DCA every week rather than doing it every two weeks. But of course you can do it based on your own wishes and which one is best in your opinion.
But sometimes you also need to consider a lump sum, it is a good option to get more bitcoin at a low price; for example when the correction is more than 5%. I've done it a few times this year, but DCA is the one I prioritize.