Took a quick glance, and first thing i noticed was your tree is a bit odd. You’re going for all the jewel sockets without an adorned, and also without full 4 line bis sapphires. You’re also not using a megolomaniac, which could have 2 useful notables on there that would outweigh the benefit of 3 good lines on one of your sapphires.
If you do get an atziri’s chest, make sure it still has the conversion line (corrupt skills have 50% skill mana costs converted to life). Along with 2% conversion on a suffix on a heart of the well and the Blood Transfusion cluster on the tree, you can get the benefit of blood magic without needing the helmet or the keystone.
This would open up your helmet, which you’d use the popular cultivated Vertex. A +3 skill one should be relatively cheap.
If you do go that route, you now have mana that’s doing nothing, so you could make it useful with Mind over Matter to make it an additional defensive layer. You could further this by converting all your es into mana with Eldritch Battery, and in that area you could get Arcane Intensity and the max mana node nearby. This gives you more spell damage per 100 mana.
If you swap to a wand/sceptre combo, you could further your damage by running Wrath Sceptre, which gives fulmination, which synergizes well with lightning spells. Then, with the extra spirit you could opt to get Mana Remnants to keep your mana high and full/overcapped as a defensive layer, but more importantly Archmage, which gives 4% damage as extra lightning per 100 max mana.
And if you do all of that, all of your damage skill gems get the ability to use Zenith II, which is a huge dps gain because you’d always be over 90% mana since that’s your health pool, and it’s a “more” damage modifier, which is multiplicative on top of all of your increased damage %.
If you do get a 221+ spirit sceptre, then you can also opt to include Cast on Elemental Ailments and put something else in there, or move Arc over there and in CoC you could do the Doedre’s Undoing with Elemental Weakness that’s popular this league, but that would require you to get the Impending Doom cluster on the passive tree, as well as up to 29% faster curse activation on your sapphires, split between 2 of them.
