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.
The market is very dynamic. No one in this world can accurately predict the direction of the market. If you are absolutely sure of the prospects of the portfolio you hold, then I don’t recommend selling everything. If you are not sure, it is best to take all profits and mix in a new portfolio that is still promising. The market will always go through a "bearish-sideways-bullish" cycle, so we need to learn to take profit/stop loss.
Basically, most professional traders also create bases and targets for selling their assets. For example, if he buys a coin at a price of $5, his target to sell for a profit is $7, however, if the price drops and worsens, his target to sell at a low price is $4. So, when the price reaches one of them, they will sell the asset.
unfortunately, I don't use that method. I continue to hold the asset I own even when the price goes up high or down. I only sell it when I need money. Besides that, I'm also aware of the cycle. I also believe in the coins I hold today.