Summoner build + chaos damage: suggestions?

Hi Guys

this is my build.

https://poebuilder.com/character/AAAAAgYAUEI8vSxGRXyMNhzcLUdtGSL0bAsNjeyKfRhr26crNbkRUGpDwFQI9LzqJ6l_xvIev5fJPUmx18_5N--IkycqU2KVsnC0DB2q4YhGcUkTkx_mWIngwzrKSm-egwlXyQ186roo-vnogsdqrFqRqH3T-wZJE2xTUkWdmuDr7o9Gpwi4k_qAKpjZC_rSHRQ26SSqFm-ApFXWZOcXL_fXm6FNuRCXRATMvIVgqsQ=

I'm a shadow summoner where first source of damage are minions and side source is chaos damage based on desecrate + spell echo and vulnerability curse. I really like that spell.

I also use Discipline and Purity of the Elements.
I have 1847 life points, 1762 shield and 950 mana.

Well now i'm lv 68 my damage is good, i don't have real problems in normal game and in lv66 maps but in corrupted caves, from lunaris temple or gardens etc. etc. for ia, i die costantly.

Now i see that my problem are shield or life or elemental resistance.

Do you have any suggestion to help me?

chaos damage nodes are a waste, desecrate base damage is too low and you will never deal damage significantly with it. Consider desecrate as an utility to summon corpse, nothing else.

You should increase your life and optimize your resist on gear.

Just increase life? No shield also?

And i increase only shield is the same?