We recommend that if the price of the Coin goes down, it's better not to move and wait for the coin to stabilize again. If the price of the coin goes up, it's time you move to take the "Sell" position. Because that's when it's a good opportunity to get the profit you want from rising coin prices.
Everything is correct. If the price of a coin goes down, then it is not necessary to do excess movements. It is necessary just to wait for it growth and as soon as it can be sold it at the level necessary to you. But also you should not hold it too long, the price can again will go down.