What was your biggest crypto mistake?

Feels like almost everyone who spends enough time in crypto ends up with at least one story they wish they could redo.

Maybe selling too early, holding too long, chasing a pump, trusting the wrong project, losing access to a wallet, or ignoring security when it mattered most.

The space moves fast and sometimes the lessons are expensive.

Curious what stories people here have — what’s a crypto mistake you made that taught you something important?