My worst experience was Not exit at the correct time. there was a ICO it gave me 10X. (6500USD) but i did not exit at the correct time so it went for 400usd.
This is a common experience with everyone here I believe so. And it hurts when that happens. Losing your profit because of greed of not taking profit at the right time is something that every trader and investor will continue to experience. This is my worse mistake so far if that will count as one. I have been lucky so far on other bad sides.