What missed opportunity that you can remember do you feel the worse about?

I had nearly 4 Bitcoin in early 2017, when they were worth about $1,600 a piece.

And I sold them all approximately 3 months before they became worth $10,000 a piece and approximately 8 months before they became worth $40,000 a piece.

And I'm not sad about it, I made profit off of them, but it does make me a little bit morose and that I could have had 160,000 instead of $6,000 by simply waiting about 8 more months.