All I can suggest past that is to make a point of using the designations more often. It didn’t really click for me until quite recently, either, but the only thing that seems even remotely likely to have triggered that click is that a project I was working on involved discussing some pictures with a friend, and I found myself having to actually think about whether X was to the left or the right of Y a few times a week for a couple months.
That’s how I figure it out. But getting it from “I can figure it out eventually” to that instinctual knowledge just hasn’t happened.
All I can suggest past that is to make a point of using the designations more often. It didn’t really click for me until quite recently, either, but the only thing that seems even remotely likely to have triggered that click is that a project I was working on involved discussing some pictures with a friend, and I found myself having to actually think about whether X was to the left or the right of Y a few times a week for a couple months.