Even if you think that the price will no longer fall, you still should not buy for the entire available deposit. You need to take into account different outcomes, both the growth and the further fall of bitcoin, and it is for this case that you should have reserves so that you can buy at a lower price, and not just watch a further fall, without the ability to buy. Yes, in the future it will still grow, but also don’t want to miss the opportunity to buy more bitcoin.
That is basically DCA. If you do not buy with all the deposit, keep some aside, and then keep on buying it with intervals (or when it drops) that is the DCA method that will make you richer. I believe that the best thing we could do right now would be to make sure that we are not certain about what bitcoin will do.
Because, it may do something awesome right now, or it may not do something awesome, we have absolutely no idea. This means, if we have no idea, why should we risk all of our money all at once? Hence we should be investing into crypto a bit more carefully and the most careful method is DCA, where we invest with intervals and put times in between each purchase.