You're not entirely wrong, but you're changing the definitions of so many terms to fit your narrative.

That's the point, there was no "sudden decline" It fell from 20000 to 16000. Suddenly. A decline, that happened suddenly.

they are microcorrections That's not even an investing term.

You have to ignore them if you plan to buy low and sell high. You do not have to ignore them, and I cannot understand why you think you do.

There are thousands of historical examples of exponentially-rising asset bubbles. If you are looking for signs that you might be in one, you look at the duration and magnitude of the short-term price movement. When something rallies 20% and then falls 25%, that tells you something. It means different things for the asset than say, a 5% move that happens over the course of a day.