PoE 3.22 Ancestor Champion, Cold builds

Hi all, I league started with Champion Elemental Hit and took it as far as I could go with the limited knowledge I have with crafting and mechanics. I went with lightning conversion and Doryani's prototype as well as Quill Rain which has been great but the damage has now fallen off quite a bit and I was wondering if there something I can do to make this build go any farther so any suggestions would be greatly appreciated! Thanks so much! POB:

Leveling 1-12 (still probably best way to level) Splitting Steel, Chance to Bleed Leveling 12+ Sunder until Boneshatter SWAP NOTABLE 3.21 CHANGES -determination reservation gone, this requires us to grab a mana mastery - which is relevry, this has 10% aura effect for our Pride aura as well. OR USE ARROGANCE PRECISION INSTEAD -new 1% max res armour mastery with armour on all gear (hybrid armor/eva is the gear we're aiming for anyways for suppression) -suppression mastery moved to evasion mastery and requires at least a hybrid chest on (this build already ran hybrid EVA/ARM for supp