I sell coins the moment I understand that this is the right decision. Sometimes I have to make quick and unexpected decisions, depending on the general state of the crypto currency market.
I think investors have a different type and they are different when it comes to cryptocurrency. People sell their ownership in panic, while others sell their ownership when they need money. In my case, I usually sell my ownership when I need money. I also sell only to switch from evil coins to good, if I don't think the coins have the prospect or decrease in volume then I would think of selling my coins. not because of the need for money. I invested in crypto for the long term and got the maximum investment return.