From my perspective, for anyone who had reached an overaccumulation status, then such person would just sell from the overaccumulated portion of their holdings and not necessarily sell any bitcoin with any expectation to buy back cheaper.
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If you have 200 coins at 100 each or 20,000 invested they are now worth 200x108,000= 21,600,000
There would be no need to sell off all it.
Selling off all your BTC at this point in time makes close to zero sense.
Selling off some may make sense. You're absolutely correct, but it all still depends on your reason for selling.
At this stage of accumulation, it still makes zero sense if your purpose for selling off some of your Bitcoin is to take advantage of a potential DIP because at this point, I believe the investor may have already reach a fuck you status or a state of overaccumulation and there'll be no more reason to accumulate further.
Well except your purpose for selling (some of your holdings) is to diversify your portfolio, at least that sounds more rational, because you'll be able to capitalize on the significant gains while you're also still able to maintain some sort of exposure to the asset.