Sometimes traders are in good profit but they could not decide whether to take profit or continue to hold it is just because the market is booming and mind says the market will rise more so we should wait some more time and while deciding this sometimes end up in a loss of profit so the target should be set in advance and when achieved should not be greedy for more. Apart from this one can sell that much amount that returns its principal amount of investment and rest can be hold for long.
If a trader doesn't know how to handle their profits, I can only say that before starting work, they didn't define the target they wanted, they didn't even have a backup plan and when unexpected situations come to them, too many options confuse them and sometimes it will be a failure in investment, end up in loss as you say while their selves are making a profit. My advice is we should maintain certain goals, set stop losses with positive returns, this market does not have absolute profitability, sometimes we should accept little profits, instead of crying in failure
if we have a plan, then stick to it. Some people find it hard to follow because they are emotionally affected by what they have heard around, what they thinking is negative. But rather they have to follow what is their plan, the quickest they change it. With this, it is no surprise that they will never reach what they aim for, they will go anywhere.
Anyway, we can't say that there is easy money in crypto and we should not have to think about it. Crypto investment filled with a lot of market challenges but if we are able to manage this thing, this could be just an easy game.