How could one make this build more tanky (penance brand)

Hi im trying to make penance brand work and so far it has some nice damage to it, I just dont know how one could get tankier.
PoB:https://pastebin.com/RCxzePVx

Thank you for your help

EDIT. I dont even know if the damage calcs and everything is setup correctly, I never really understood fully how penance brand works so if you know I would gladly know