I don't know if I am cursed or something. If I sell a coin now from airdrop/bounty few days later that coins increases much that you will regret selling. If I hold a coin from airdrop/bounty again that coins price decreases much that you will regret not selling right away. I'm confused now whenever I sell the price increases and when I hold the price decreases. Am I cursed? 
Its completely depends on the project. If coin is pump or dump using pumpers and dumpers group then you have to book profit or ignore loss because its short time movement. If any long term strategic changes or any big announcement happening then has to hold for longer time.