What was your biggest fail with crypto?

I can't name just one since there were so many. Those are mine:

1. Buying a lot of Cardano before the launch of smart contracts.

2. Trying to time the market to make profit from Doge/Shib by rumors

3. Thinking day trading is easy money lying on the floor.

4. Buying too many different coins instead of investing in a few good ones.

5. Panic selling/buying

But I guess those can be summarized to our favorite buy high sell low and believing rumors/upcoming news.

What were your greatest fails with crypto?