Have you ever sold out of fear and then the price goes up?

Many believe that in crypto, the one who knows the most wins... but in reality, the one who controls their emotions best wins.
I have seen people with great knowledge lose money simply because they cannot handle the pressure when the market drops.
Fear and euphoria are the worst advisors when money is at stake.
Personally, I believe that discipline is worth more than any indicator.
If you have a clear plan, the market noise stops affecting you so much.
Share your experience and advice.