True hodlers shouldn't have issues hodling... I understand emotions can play a role, but if one is characterized mainly by a hodler mentality, one would not sell but rather accumulate during the bear market.
In the bull market, it is different, but only if you want to take profits. Otherwise, the hodler keeps its portfolio and accumulates no matter the price. That may not be the most profitable, given we have a rather clear succession of phases in the bitcoin cycle, but it is one option.
I like how you put it, in case someone decides to take profits in the bull market:
The sky is the limit and you should choose whether will you take a rocket, a plane, or just a ladder to take some profits...
But we have to be careful with rockets. They sometimes explode on takeoff. :)
We also have to be careful not to get caught holding our bags when the market turns. And the problem is we don't even realize sometimes that's the end. We often hear then that it's a needed correction before it goes back up to the actual target.