looking for help and advice on my hardcore templar

Hello,

I would like help and advice on how to make my hc Templar more tanky. This is the emphasis I want to focus on, not damage.

My main skill is Vaal Cold Snap supported by Added Lightning Dmg. I also have Frostbite supported by Blasphemy, and use Frostbomb here and there.

I seem to be kind of squishy, though. I'm not sure if I'm ready to attempt High Templar Avarius yet. My Ele resists are currently 76/75/72 and Chaos Resist 33. My Armor is only 2729 and I have 1680 Life.