This is indeed a tough one. It’s hard to sell when things are pumping and you don’t want to miss the top. But then you don’t want to miss the top and end up losing 90% value like that happened to most alts in 2019 after the pump. Controlling greed is key.
People should start to use their sense to determine which is the best time to sell our coins. I have seen that so many times people have not sold their coins when the bullish happened and they have ended in a big lose cuased by they can't take the opportunity and they keep hold their money in their wallet. That's something that must not be done by anyone.
People should sell at least some of their portfolios.