With your example, we know that from $1 to $3 is 300% price up and this is the time for sell to get the profit.
I don't know why people still holding if they find their coin price already multiplied 3x.
Even traders usually sells their coin when the price up only 10-30% already, we must learn how to know the time for hold or sell our coin.
Some projects always offering and make promises that their projects will be get new developments, so the price "might" be up again, but you know it's always bad when youre greedy. selling when you already getting enough profit is the best way to avoid that kind of situation