Once you acquire your 4-set, your gameplay is going to change a bit since you get a free Starsurge of Starfall every time you enter an eclipse. It is important that you make sure to spend it before over-capping your astral power.
Raiding: Whispering Incarnate Icon and Furious Ragefeather will be the best options for raiding.
Mythic+: Furious Ragefeather and Eye of Skovald will be best for Mythic+. Whispering Incarnate Icon can also be used here if you don't have one of the other two trinkets.
You want to craft an Elemental Lariat at 418 Item level as a priority, followed by your weapons (when you can). A ring is the best option after that.