Assassin/Ninja Help Need Help with Build

my spell based Shadestepper Build has good ehp and good mana regen etc but lacks in spell damage
how could i get more spell damage?
build:
https://hppeng-wynn.github.io/build...0Ji0Gc16000y1a0Z1d000000z0z0+0+0+0+0--p-GNtN1

i am lvl 103 btw

 

Reassign leftover skill points (you have 35 in agi) and perhaps replace the rings

 

https://hppeng-wynn.github.io/build...Ji0Gc120e0j20051g000000z0z0+0+0+0+0--JzdTzI30
WynnBuilder build:
> Sizzling Shawl
> Hetusol
> Greaves of the Veneer
> Phage Pins
> Downfall
> Photon
> Diamond Solar Bracelet
> Contrast
> Flameshot Hilt []