Learn the technology, figure out a design workflow, and understand how to prototype with little to no coding.
Push the boundaries of conventional applications. What are some AR applications for industries that have not been explored?
As a first step, this medium post by Ryan Betts is the best all-around resource that I have found and it's recent. Even though it is for VR, the AR applications seem to be parallel.
I have optimized a workflow for mobile app design over the years to center around rapid prototyping. Time to shake things up...