As greed goes up again, it's time for some provision for your sanity's sake.

(1) in a few days, weeks or even months time you might think "i should have really sold the pump" as we drop below $40k and altcoins suffer once again. war, inflation and supply shortage never allowed for a proper bullrun. how could you have been so stupid and not sell pumps, but instead buy on the way up just to see much better prices on your way down?

(2) in a few days, weeks or even months time you might think "i should have really bought along the way" as we go above $50k, perhaps reach a new ATH and altcoins go wild. prices were sensational just a few months ago, and you could have easily invested more at some point. how could you have been so stupid and not buy more, or maybe sell too early because you didn't think a bullrun was possible?

both scenarios are possible. the important thing is that however logic and forseeable things will look with hindsight, they don't right now. you're taking chances whatever you do.

for me, the key lies in conciously acknowledging beforehand that you can not tell what will happen, and making a rational choice that you're sticking to regardless of euphoria or anxiety. this doesn't mean that you can't change plans, and you may well be guided by emotions, but always explain to yourself, why you're doing what you're doing.

TLDR: make a proper plan, acknowledge you can't know what's going to happen, and remind yourself afterwards that you did what you thought was the most rational at the time.