Even if you, in the moment, do not have good reason to be confident that you are not a Boltzmann brain, you do have much better reason to believe that any entity you create in the future is not a Boltzmann brain.
If you wish to improve the accuracy of that entity’s beliefs, you can do so by instilling that entity with a low prior of being a Boltzmann brain.
Among the entities you will create in the future is your own future self.
In addition to what DanArmak said:
Even if you, in the moment, do not have good reason to be confident that you are not a Boltzmann brain, you do have much better reason to believe that any entity you create in the future is not a Boltzmann brain.
If you wish to improve the accuracy of that entity’s beliefs, you can do so by instilling that entity with a low prior of being a Boltzmann brain.
Among the entities you will create in the future is your own future self.