Taking Spark Trickster to Ubers

Hey guys

Started playing Spark Trickster after not finding a decent build the whole league and its been a blast. I already did every invitation( except hidden, but havent tried it more recenty), including 100%+ quant elderslayers and medium juiced feared, also cleared every normal boss. In this regard, Nimi's really allowed me to be able to be so much stronger and clear this type of content without much difficulty.

But I want to try and tackle ubers on this build, something I have never done before, but I don't know what I should prioritize to try and do it.

POB: https://pastebin.com/nx5B7v0i

A note on the mana reservation: I use inspiration + divine blessing for wrath, turning off one aura and popping wrath and then the aura again. Or, for some content, i just use Wrath instead of grace.

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To do list for now:
Better wand

Level 21 divergent spark, awakened spell echo

Finding some gems to slot in the helmet, they lost their purpose after acquiring nimis.

Sometime in the future get a helmet with +3 spark proj, to go from 15 to 16 proj.

Necromantic Aegis to try and fit more mana reservation and be able to get more auras - also a new ashes with higher mana reservation.

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But the way I see it, most of this gets me more damage and I don't think that would make me able to tackle ubers by itself? Also, while obviously I have thrown a decent amount of currency at this character, I'm definitely not swimming in currency - Should have about 30 divs when a couple of big drops sell.