Earlier quoted context omitted.
This is the reason dollar-cost-averaging works. You buy less (shares) when the market is high, and more when it is low, without thinking about it and without trying to "time" your transactions (which almost always fails unless you have inside info).
Dollar cost averaging does not work and has never worked. Because most assets have unlimited upside and unlimited downside. A stock or asset can go ballistic for decades like Apple or Bitcoin, or it can fall to zero value. There are no mathematical ways of winning investing. If it was that easy, everybody would do it. You can only follow your heart and do your due diligence.
Spot equities and crypto have limited downside. You put in x, most you can lose is x as you observed. Unlimited downside is not a thing outside certain exotic derivatives.