Smarter Blazes

Blazes are meant to be a medium-difficult threat for Nether Fortresses, but they are pretty easy to deal with, so I would suggest making them a bit "smarter"

An idea would be that Blazes would fly in formation: when there are many blazes in a 10x10x10 box, they would start forming a formation, and would begin shooting fireballs in a way to form a constant fire; they would also tend to move as one large group, end if the player tries to get towards them, they would tend to go backwards, like Skeletons, Pillagers and Piglins

This would make Nether Fortresses more challenging