I actually don't quite understand what you mean...

but I also look at the market, there are always altcoins whose prices have dropped a lot, but those who buy them are rare.
but for example, just 7 days later the price went up even up to 100% indeed I always saw when the price went up the people who bought it were more and more than 7 days before,
Is this what you mean?
 and indeed sometimes I also feel strange when the price is expensive but who bought it and why didn't buy it when it dropped 7 days ago...

in my opinion about this because so many people are
have a fear when the price goes down, for fear that the price will fall even more and also when the price goes up the fear of missing the price is finally forced to buy with the aim of having a big profit,
but the act of buying when the price rises high usually has the potential to lose if it is for short-term investment.

is that what you mean op?