Maybe today some lost a lot of their portfolio, maybe from thousands of dollars to a hundred of dollars, this is why taking gains or profit are very important
since the start of 2021 the price of tokens have gone have breaking statistics, altcoins take an all-time high, and we are very happy all these things turn into a nightmare in a single day, almost all of my friends never touch their coin hoping they would reach another all-time high, the same thing that happens in 2017, now the market almost wipe all of our portfolios, what's the lesson of this, when there is a chance to take profit, take it, small or big, it's again, I saw some posting they earn millions, they are so happy, but after a day they regret it, why because they are so ambitious, and no contentment on what they have, always take gains, don't let it slip away or you'll regret it.
But what your saying is pretty vague. First of all, when are you going to take profit? can you say that I should take profit at 5% gain? 10% gain? 20% gain? what if that coin suddenly burst into 100% gain? it's really hard to tell people to take profit when it's really hard to predict that movement of the market.
I think what's most people missing is a goal. They just invest in whatever coin they want and just leave it, expecting to be a millionaire. They don't set a realistic gain and in turn makes them regret later on.