Finding that non-dual state, the easiest way, the only way I know, is to actually see nothing. You can’t see nothing, right? It’s nothing. But if you see that emptiness, that is nothing, no concepts can attach to it.
So just really think about what is nothing, what is zero, what is the absence of anything, and close your eyes and look inside and see there’s nothing there. Your mind doesn’t really exist; there’s like nothing, nothing there. But there’s you. You aren’t a thing either. You actually are that nothing. Just see it, relax into it, step into that until you know that you are the driver in the driver’s seat, that spark of life moving you.