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.
Sometimes people not really aim for target price because they actually don't know or can't analyze in where price of coins that he already bought will go. Like me, i can't analyze and only bought bitcoin blindly, if increased then i will happy, but if dumped i will still hold and not much see market.