Good bow builds?

I have been using a caustic arrow build this league, and it is fine up to tier 7 maps, but try and go much past that and you just have no survivability to deal with anything, at 4.2k life at the moment and there does not seem to be a way to progress any further.

Since I already have a 6link +3 bow that cost me 4.5 exalts, are there any other VIABLE progression builds?

It is insane to think that my previous character was an essence drain/contagion one, and I could do the red tier maps with all of the curses on me without dieing easily, have 10k ES and 3 aura curses. Seems my build for this league is absolutely catastrophically awful compared to that and ive messed up on build choices.