In this bull market, basically many people are not on the bus.
Either they thought they had escaped at the top and kept waiting to buy at the bottom, but ended up not getting the chance.
Or they were too panicked before, cutting losses at the bottom, and seeing prices rise made them even more afraid to chase.
Or, they got addicted to short-term trading, sold thinking they could buy back… but as a result… made small profits but lost big money, not worth the effort.
Some even got addicted to short selling, didn't have time to turn around, and ended up back where they started overnight.
In short, the bus is still very light now, and it really is easy to go crazy.