There will always be a time to learn a lesson from trading decision and thats why I always advised traders to also have knowledge in selecting the perfect coins not just a hype base crypto that will be worthless in the future.
If the invested coin is good the next thing is to be patient.
But how would you know when you are reasonably patient, and when you are just falsely keeping the loosing position would you would better off sell quickly and invest elsewhere?
The only way to kbow you make a reasonable patient is when you wait till the market bullish is back and you are not selling at lost price but selling off quick to invest elsewhere is a habit of impatient and the 90% of traders with no sufficient portfolio management knowledge that make such decision are among the traders that later quit.
Meanwhile, it better to invest elsewhere using a new capital while you keep previous invest till it green again.
That's was the first impression i also had when i joined cryptocurrency and i have made a lot of bad investment decision but learn from it.
That's why the first statistic is that "100% of people start trading with the hope of getting rich"

Yes, that's what it is and it because most newbies only read the success story of crypto investors without studying the thing they did before they are successful.