All three are mistakes that I have made, but my biggest mistake that caused a big loss was number 1 and 3.
Number 3 mistake was made when the ICO was still trending and when the price dropped thinking it would improve but instead the value slowly but surely became 0 because the exchange delisted the coin.

So traders who make mistake number 3 are very likely to make mistake number 1 because they are reluctant to cutloss.

Mistakes should make us wiser and never be reluctant to cutloss, to avoid bigger losses unless you trade in Bitcoin.