Looking for ideas/help 'Rolling magma totem'

I've been running this rolling magma totem build that originally started out as a failed explosive arrow build. after realising the EA was trash compared to what I was leveling with I decided to stick with and gear the rolling magma setup and was wondering what i can do to improve it.
-where else to go in the passive skill tree or what should change
-What gear to get/improve
-what skill gems should be changed

Currently I can really only do maps 7-8 without too much trouble

https://pastebin.com/yWXWw16p

This is also the highest/furtherest I've ever gone in poe
Last closest build was the Arc witch by Enki