The profit taking between traders and investors is different, but in principle it must have the price target. Before we buy/sell in the market, we must have a careful plan so that we can stay in the market for a long time.
That is for investors as they are to stay longer to profit but for traders you do not have to stay as long as investor do, if you do then you are am investor and not a trader. A trader is for short period of buying and selling a coin. If you were to stay longer than it can be for few days. When you buy a coin, you should take profit as the coin increase because if you do not then it can cause you less profit as the market falls.
You should have all your plans layed out before you start trading, know the price you want to sell and only adjust if the market bullishness increases then you do not have to sell all your coins at ones, you can sell on fractions. But if the market does not change then do not adjust your plan but stick to it and sell at your initial profit taking price.