These were probably the last crashes before the rise of crypto exchanges.
But more importantly, what should not be forgotten and what always happens during such times is the frequent news of firms with significant market influence collapsing or being hacked. In these cases, there are always sudden and impactful downward spikes.
So be careful,
don't let your money be liquidated,
play with 5x leverage instead of 10x,
use isolated-margin mode instead of cross-margin,
classify and reduce risks.