It is easy to make post mortem decisions, i.e regretting it would've been wise to hold for few more weeks. Getting 5x profit instead of 2x. It's only lost profit, it is not lost investement, remember that. I have never sold at loss, except once. Selling a bit early always gives me selling hangover, but it passes quickly. I normally sell on 10-50% profit price point and buying again lower or something else. As long as you're not losing money, do not regret a lost profit. Better to be safe than sorry, you could've lost 50% in a dump.