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From what you've said, it is clear you are approaching Bitcoin from a trader’s mindset, and not the long term investing mindset. And honestly, I respect how open you are about your style. And it also shows you are still be new here.
You might want to take some time and really pay attention to the discussions happening in this forum. Most of us here are not chasing short term moves or trying to time tops and bottoms, because it is not the best approach to Bitcoin investment, we’re building conviction over the long term. Bitcoin is not something you flip for quick gains, it is something you accumulate, understand, and hold with a long term vision using DCA method.
It seems like you still need to steer this person towards a long-term investment perspective, focusing on buying Bitcoin without worrying about determining low and high prices. This is because these investors are willing to buy Bitcoin at the current market price and don't immediately think about selling it again in the near future. And if someone can't afford to buy a large amount of Bitcoin all at once, they still have the option of paying in installments using the method you mentioned (DCA). I also prefer this method when buying Bitcoin without the intention of selling it in the near future.
This is because investors don't have to think about a specific entry price when buying; they simply need to put their money into the market. They can buy immediately without hesitation, and when the amount grows large, they can simply transfer it to a personal wallet on the exchange where they bought it, so their assets can be kept in a truly secure place.