The process of enlightenment is all about uniting.
In Self Realization, the jiva recognizes itself as Atman, the point value recognizes its universality. The Self wakes up to itself through this form.
In the Unity stage, we recognize subject and object to be one and they collapse together in wholeness.
In God Realization, we recognize our expressed form of the Divine is Atman, the Self.
In Brahman, remaining subtle dualities like conscious-not conscious or existence-nonexistence collapse into one totality. It is the resolution of remaining paradoxes.
In ParaBrahman, only pure Divinity remains. We recognize everything we experience to be Divine qualities or Shaktis.
We can make these points retrospectively from a later perspective. We may not see it this way when that shift happens.