Profit is a profit. You can't magically sell your coin at the top of the market. Just receive your profit, and take a lesson on your trade. And I don't think that profit isn't good profit, maybe you just biased by how high the coin goes instead focusing on your trade gain.
Of course profit is nothing else but profit but here the author is upset with his decision making power due to which he did not cash his coins when the market was green and not blame his luck to be bad. I say there is not influence of luck in business. There are so many people out there who are upset and holding their coins for long. Why are all the people getting unlucky at the same time? Bear in mind there is no luck. It is rather a probability theory of life.