Some of the exact break points might have changed, but these guides are still accurate: Guide: Recommended stats for end game
How to make your own Gladiator: a guide - #2 by veretragna
Recommended DA is 2.8k to 3k, recommended armour is 2k for a caster and 4-5k for a melee tank.
Resistances you should generally aim to be over cap by 30%
Physical resistance and damage absorption are additional layers that are important but difficult to invest in.
Also do you have any circuit breakers? Tortoise is one of the most obvious, but there are plenty of others. Skills, items, other devotions and components all have options that will help you survive a single big hit.