Let's not look to some future day when all the stars properly align and some mystical state is arrived at. Let's look at this very moment, this very instant, apparently a ME living in a world.
Let's take a look at what we believe to be the case, what we take reality to be, what our concepts about this moment are.
We believe there is a ME in a body, looking out at and experiencing a world, outside of me, apart from me, other than me.
To have this idea is to automatically and irrevocably separate reality. Can you notice that? To have this as your template of reality is to automatically assert the separateness of reality. AS a ME, AS some "thing", AS a part, you are opposed BY the world, automatically separate from it.
So what method or amount of seeking can heal that split? AS this separate part, can you ever heal that split? Can you notice that it is this particular idea of ME vs. world which IS the separation itself? Can you realize that in order for reality to be whole, that individual must be false? The individual cannot find wholeness, cannot realize "oneness", for it is the individual itself which is the assertion of separation.
So we must look at WHY we take reality to be separate, WHY we take this present experience to be composed of a ME vs. a world, WHY we take this present experience to be a ME seeing a world.
We must not be stuck on waiting for some realization to come FOR that me, but immediately look upon that ME with suspicion, immediately, within this very instant, to look upon that individual entity as potentially false.
In doing so, we will naturally see the mechanism at work, the mental assertions in which this individual is created as opposed to a world. In not waiting for our conceptual understanding to flower into some spiritual, mystical state, we will be forced to look upon this very instant and notice the construction of reality as made up of separate things.
This ME is built in thought. This ME is a construction, a mechanism, taking objective experiences and applying the obvious subjective presence to them.
You can say "I AM" with conviction. That isn't something which is constructed. That is something innately true. You are pointing to or referencing something unmistakable and intimately known. But that to which the words I AM point is applied TO an objective experience - a body, thoughts, a name, a job, a title, a role.
Notice that identification is simply applying that obvious subjective presence - I AM - to something objective, something found in experience.
Therefore "ME" is always an experience - ME is always something you know. ME is always something arising in one form or another - you can be aware of that ME as it arises. You can watch that ME take shape. You are always able to notice the ME.
And if you can notice the ME as it takes shape, can it ever be what you are? Isn't it merely a constructed identity? Isn't reality as ME vs. World a constructed or imagined reality? Isn't this very moment falsely asserted as a ME vs. World? Isn't that entire paradigm a construction?
If that is clear, then right here and now, reality is whole. ME vs. World is a story told about reality. This present experience is an experience of wholeness, so to speak. The idea of an objective experience breaks down along with the parallel idea of a subject. There is no one separate from a world - there is only what IS - only present, whole reality. There is simply wholeness, fullness, taking shape as what we call experience, requiring an experiencer. That ME vs. World is then not a problem, not a believed-in reality but merely an innocent and natural expression.
Experience is then a concept requiring the equal assertion of a ME who experiences - there is nothing wrong with it. Like a mirage it has lost it's weight or reality yet is a useful concept.
If we demand that this ME disappear forever then we have missed the point. If we demand some confirming spiritual state to arrive then we will continue to miss the message. If we demand the mind to provide something other than a conceptual understanding then we will constantly overlook the obvious wholeness that is already the case.
Advaita means not-two - reality isn't made up of an infinite number of things that will someday be brought together into One. Advaita is already the case, reality is already "not-two". There is no making it so - there is the realization that it never WAS two.