Assassin/Ninja Help How Would You Improve This Build? (thunder Hybrid)

https://wynndata.tk/s/pdlmv9

I'm going for a hit and run hybrid that uses Curse+Vanish boost for powerful Multihits. I'm also trying to have a secondary playstyle on the build - alternating between Spin Attack and Multihit to keep bosses perma-stunned, and using mana steal to sustain the cycle. Life steal is there for when I mess up.

Anything but mythics is fine.

Any help would be greatly appreciated, thanks in advance.