Help with Accuracy?

[Arthos]

Still gonna check out that Skirmish gear. Unity though, I saw like one ring with a decent amount of acc and that was it. So, still at a loss as to where I can upgrade accessories.

Grounded Mantle gives 20 Accuracy, Kentarch belt is also decent. You can use the NQ and HQ of Cacoethic ring. These 4 pieces give you already atleast 54 Accuracy more.
Emeici is a good weapon and also adds another 10-20 accuracy.
There are more and sometimes better pieces in other events, like Honed Tathlum from Delve or Zennaroi earring from Incursion.
But btw they all are not really "upgrades", you simple swap them in when needed.
With Taeon and these accessoires you can easily do D Battlefields or T1 Escha NM's.