Lightning Arrow Raider Help

I'm playing a LA / Artillery Balista build and I feel like my damage is abyssmal.
I can do low tier red maps but almost all Rare mobs require me to use AB mostly,
and even then damage is really sub par.

If anyone has an alternative build which is a Single skill or has an idea how can i substantially increase my damage i would really appriciate it.

pob: https://pastebin.com/ZSMfSsnX

Currency wise i have around 4.5 Div.

Thanks.