its really hard just take profits and walk away sometimes because of our human emotions of how we would lose out if the coin continues pumping, alot of traders find it very difficult to close a winning trade cause they are greedy and want more profits from that trade, this is where having a target profit helps out, cause by having a target profit you will never find it hard to take profit.
It is very important to take a profit not to lost a lot. But not all people know when it is necessary to take profit. If investor do not have experience there are investment funds like
https://defiscale.io/ that invest in gambling and finance and pay investors a stable income.