Lesson-1: The more greedy you are, the more you will lose.  I had enough in 2018, I could have saved some money by selling them, I would have gotten richer by now, but I didn’t do that and waited for more.
Lesson - 2: Don't panic and learn to save for the future.  I remember I sold some valuable assets in the panic that I should have kept for better market conditions.

Every lesson is important for the future and using it I still survive in this crypto market.