Although, no investors is happy when his investment is declining instead of appreciating but a good investor that have good understanding of the volatility nature of Bitcoin will not be under pressure when Bitcoin is in dip because the rate at which Bitcoin appreciate is much more than the the decline. And this is the reason why planing for long term investment is one of the unique quality of a good investor because if you hold a starch of Bitcoin for long term you will surely recover all the lost incur during the dip and still maximum your profit in the future.
Irrespective of any circumstances a good investor is always patience and perseverance and will always tend to sustain his investment for long term.
A good investor is willing to reevaluate their stance on Bitcoin not based on price, but based on facts or available information and the processing thereof. Being steadfast doesn't mean you should never reconsider a financial position regardless of new information. But price changes are not equal to new fundamental information per se. It could be, because someone else knows more than you and takes action. But in a volatile asset like Bitcoin, behavioral economics are important and can sometimes be ignored.
You can see this with Tesla now where it is not as easy anymore to tell in how far the share price is decoupling from fundamentals because of Musk polarizing so much. That is an investment where reconsideration can make sense despite fundamentals still being ok. It depends, but being steadfast is not a good standalone characteristic per se. What are you going to do if you see a tsunami coming your way at a beach? Stand there like nobody else hoping that being steadfast lets you get through it better than anyone else? The circumstances have to be taken into account.