tell that to people who bought their coins at 12$ back in the time.
In majority of the cases holding is a better option as you can buy during the dips . Say I bought at 6.5 k and market goes till 6k or little lower so selling in a loss would not make sense to me unless I know it would not rise or I require money. So before entering itself you should always invest money which you do not require in short term and have a patience to hold the coin.