Make a Wither even more challenging.

First of all I am not talking about the overworld Wither, I'm talking about the Wither boss fight in the Nether. By the fact that Wither's natural environment is in Nether I personally think that boss fight needs to be more challenging in the Nether. My idea is to make all the Nether portals turned off while the player is fighting with the Wither inside of that dimension, all of the mobs will know where you are except of zombified piglins, everyone will become aggressive except of zombified piglins. After you defeat the Wither everything will back to the normal and you'll be able to exit the Nether with tons of experience and more than one nether star.