Anytime the price of an asset or commodity shoots straight up vertical producing 10x+ returns, it's a good time to sell.
Let this be a lesson to anyone new to crypto, not to get greedy.
You can say that bitcoin was 10x return a year back and it was a good time to sell. But do you remember when bitcoin was at 69,000$, the whole media, everyone was shouting for 100K bitcoin? At that point, it was hard to sell when everyone was anticipating 100K.
You can call this greediness, but these whales make such an environment that a common man like us never sells and keep holding.