You use Inc+CA only twice in the fight, once at start and another past 6min. You can use it one more time at the 3min mark.
Your second use doesn't line up with second pot or heroism
Shooting Stars procs are low. It's either bad RNG or you're casting moonfire/sunfire on adds that die and you don't re-apply it on a living target. The tooltip specifies "when your most recent Moonfire or Sunfire deals damage over time". Fewer shooting stars procs = fewer starsurges which also means less uptime on starfall with class trinket.
finish 4 set, its a 6% damage increase
get legendary ring
not that you die too much but being dead = lower dps; use barkskin/health pots more and I'd advise switching Ysera's gift with Renewal to be able to save your own ass more