The ego is NOT the idea of being an individual self. It is in fact the idea of DENYING your self, attacking your self, destroying yourself, and trying to kill your self.
The ego is the very idea of imprisoning your free will, trying to make you unwilling to be free, and stripping away your freedoms as an individual.
The ego is also the ILLUSION of having independence, which is made from pictures of isolation, imprisonment, limitation and restriction, all limits placed on your actual self.
When you wake up, you do NOT wake up to the end of individuality. You wake up TO your individuality. If being in the ego means you are NOT BEING YOURSELF, then waking up means you return to being yourself.
You have free will in God and you are an individual BEING. Here is what ACIM actually explicitly says:
"God, who encompasses all being, nevertheless created separate beings who have everything individually and want to share it to increase their joy."
That's what it ACTUALLY says. So that means that we actually ARE individual beings who have everything, which automatically implies that we must have free will.
Therefore, waking up means that you RETURN TO the freedom of your will, you lift away the imprisonment you've placed on yourself, you REGAIN your freedom to be individually free, you accept atonement for YOURSELF (not for others), you become part of the atonement plan and then you help others to heal and wake up.
This entire doctrine of thinking of the ego as "an individual" is actually FAILING to overlook THE ILLUSION that the ego is presenting. The ego has been quite clever to make it look as though its "separateness" IS independence. It is not. It is imprisonment. It's the exact opposite of what it looks like.
And since people think that the ego is "a self", they then conclude that undoing that self means kind of the disappearing of that self, or like the very core of your being is ripped out and doesn't exist any more. This is absolutely the OPPOSITE of what happens.
As you wake up, you become MORE OF YOURSELF, you INCREASE your freedom, you gain access to YOUR INDEPENDENCE, you return to being a CO-CREATOR (many many quotes that prove this), and you become a SELF again. An individual in heaven. You are a co-creator with God, with your own free will and individuality.
The entire FALSE INTERPRETATION of the course has led many people to think that you do not exist and have no soul and are not individual and have no free will. THIS IS NOT WHAT THE COURSE SAYS AT ALL. If you go and read it yourself and especially in the earlier versions, you will find out that this interpretation IS A LIE, and has been spread around like wildfire by well-meaning but MISTAKEN teachers.
Being individual does not make you an ego. Having free will does not make you an ego. Being a co-creator does not cause separation or isolation. You are not "just" the one son, you are one of many sons. This IS the teaching of A Course in Miracles, not the fabricated FICTION that has been spread over the top of it to cover up your individuality.
You have a permanent self which God created, it is free, it has its own mind, it can choose, and it is YOUR RESPONSIBILITY.