Hypothetical: The halving happens and Bitcoin goes down for the rest of the year. What do you do?

This is just a hypothetical scenario, but let's think about it for a minute. Everyone expects everything to go up massively after the halving. But what if against all predictions, everything just stays sideways for a while, then goes down and stays down for months?

You may say that's unrealistic, but I have given up on trying to predict the crypto market because it never works anyway. So just in case this happens, what would you do? When is the point where you would sell? Would you still hodl? Would your belief in crypto be shaken if even that fundamental prediction turns out to be unreliable?