For prophecies - Consider having a major and minor selections in the constellations. This would allow for ways to further player choice without oversaturating the list of choices for prophecies.
Major selections would be what the choices are now IE: 4x Unique Belt // Kill Monolith Boss
Minor selections would be (as examples):
Additional reward of Gold
Double Major Prophecy Reward
A second way to earn the Major reward (1 reward only but 2 different paths to earn it)
Drop 1 extra unique piece
Drop 1 extra set piece
Refund 20% of Major Favor cost upon prophecy completion.
Similarly, accessory, weapon, idol prophecies could have respectable minor selections.