While the chart and logic look pretty good and.. well.. common sense, I have an "evil" question: what if the price falls (much) lower? What if crypto winter starts? Won't then the current "buying zone" become obsolete and may even become a "I wish I sold" zone?
I clearly don't hope for such thing happen. I hope the 100k mark is at least touched before. But a good trader (which I'm not) has to also be prepared for "what if".
Obviously, these charts serve as a guide, and not as a mathematical algorithm that gives us the 100% correct decision. And I think the OP is along those lines.
It doesn't need to keep dropping a lot, it might as well stay that way for a couple of years.
That's why I personally prefer the DCA instead of trying to time the market based on indicators like this and others. It is more boring, but safer and more profitable (if we take into account that more than 90% of traders lose money in the long term).