LA Deadeye looking for next paths to upgrade or is it mostly a waste of currency?

Here is my current POB.

https://pobb.in/bEeMzLnmhECb

Its a modified Balormage starter build. Nothing too fancy but I got lucky with some gambling and got myself a good bow. The quiver super cheap the first two weeks of the league.

The build right now clears the whole screen with one cast of LA on anything I've been juicing (i haven't tried 60%+ delirious maps yet) And I'm really happy zooming maps and clearing everything. The only issue is sometimes dying to crucible rares/uniques and crusader bosses or guardian bosses. And the time to take down those single targets which is why I added the ballista to help.

I wanted to add damage but the bow upgrade, but it didn't add as much as I had hoped gameplay wise even though I added well over a million dps per LA with it.

Is the next step to work in an expensive OMNI? or change to a double cluster setup with a large thread of hope? I'm pretty sure I could use a change in the way my gem setup is as well.

Curious if the trouble/cost to upgrade the build again would really increase the gameplay aspect of survivability and dps output if I made those changes or if it would be just a smaller stepping stone in gameplay.

I added about 1.5m dps per LA in guardian dps on POB and it was a small difference in taking out crusader bosses.

Or am I removing the ballista setup and getting up another manaforged setup with a bunch of different elemental arrow attacks?