Some traders also earn when the price is going down by shorting bitcoin. So the analogy that the price must go up in order to earn profit is wrong. That is why there are other people who spread FUD. They want to profit from their shorts.
The peak decides by the moment what? More people assume that “there won’t be a pump further”. At the moment, people stop buying Bitcoins, demand reduces and price gets down…
So, my question is,
Are there some "special" circumstances assisting people to think like that (there won’t be a pump further)?
Some use technical analysis to determine this but the easiest hint is if the price goes up so fast in a short period of time, then the price is due to reverse. This is because the bulls will get exhausted and there will be profit-taking, thus pulling the price down.
But if you mean the ATH, then it cannot be determined. Bitcoin is open to reaching new ATH all the time.