How can you possibly know where "the highest possible peak" is? There's no way anyone knows that, and it's a fundamental fact of trading. If you knew, everyone else would, too, and that peak would cease to exist.
My suggestion is to hold and sell if you make enough of a profit such that you're comfortable. No shame in taking your chips off the table at some point.
Indeed. People usually make the mistake of waiting too long hoping to sell at the peak of a pump and sometimes they miss the right opportunity. I agree with you that once you're comfortable with your earnings, don't hesitate. A lot have learned this lesson for holding too long.
If you take lessons today how to act Bitcoin then it seems to me that everyone will be the same in their decisions. Only cold storage of bitcoin will give an opportunity to get your money in an increased amount and at the same time significantly.