In my opinion if you want to deal good damage on an aura wannabe paladin like this then you need to actually include some skill that scales well, for example
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Vire’s Might [1.1.9.0] Empyrion's Judge - Paladin - Crucible 4:42
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Flames of Ignaffar is another option or maybe Stormfire with high casting speed
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Eye of Reckoning damage is converted to Lightning on your character and your build is actually a Fire build not an Elemental one. For it to do well you’d need to work on Attack Speed and use more dedicated items such as Mythical Alladrah's Spellblade - Items - Grim Dawn Item Database
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Aegis of Menhir
I don’t like the weapons you chose, I don’t think they do much for this character.
If you want to have an actual Elemental character not a Fire one - then do a proper % Elemental devotion and have more % Elemental items so that your % Lightning and % Cold don’t suck but this would be harder than including some of what I wrote before and focusing on Fire damage like you do currently.