I would like some advice on my Barbarian character.

https://preview.redd.it/g0gcy3akh3le1.png?width=2082&format=png&auto=webp&s=52785a29da94b165ada4718037e028b8674becee

This is my first time playing D4 and Barbarian. But my barbarians usually die at T4.

I'm following this build: https://mobalytics.gg/diablo-4/builds/barbarian/whirl-wind-barb

I want to ask if I should go T3?

And what items should I replace that I'm using.