Identity is completely tied to how much awareness you have.
Everyone believes that "all of their self" is defined by what they are aware of.
When you look within, whatever you are aware of as being within yourself, you will regard that as all of you. If you do not see yourself causing or choosing things to happen, you will believe you did not do it.
It doesn't matter how much awareness you have, either.
You could have a tiny amount of awareness, a very limited sense of consciousness, and would still regard whatever you are aware of as all of yourself.
But what happens when you take away some blocks to awareness and you become aware of some part of you that you didn't even know was there.
Your sense of self expands.
Who and what you are, is tied to, what you are aware of.
As blocks to awareness are removed, your identity changes. Your sense of who and what you are transitions from an isolated, limited, small little being, to a grand, expansive, unlimited and immortal being of light.
It's kind of like russian dolls. If you were inside the smallest russian doll in the middle of the stack, you would not be aware of much. As each layer is removed from the inside out, your sense of "what is there" or what is present, increases. Eventually all limitations are removed.
Your self does not actually expand, as such. Rather, you are already unlimited and infinite and omnipresent, because you are Created by God to be so.
Rather, you have placed severe limiting devices on your awareness and it has seemed to "narrow down" your sense of what you encompass. This is the idea of "littleness". You have tried to make yourself very small and limited. And you did this by adding blocks to awareness, so that you would not be aware of all that there is to you.
So as you lift away these artificial blocks, you find yourself (literally). You find more of yourself. More of what there is to you. More power, more choice, more freedom, more will, more responsibility, more causality, more love. Your identity increases. "You" seem to expand because your notion of self is having its limits removed.
As limitations are removed, you may even experience this as though your identity is being threatened and that you are dying.
You may have experienced this for example when you make a big life change and move to live in a new location or city. When many things change, aspects of you which had formed your identity, based on limitations, are shaken up in a big way. You can start to feel overwhelmed by all the new stimuli, behaviors and habits and patterns which are no longer supported start to break down, and you can start to experience a quite strong sense that you are falling apart and "dying".
This is really that the old sense of who you were, your limited self, is being broken down and the limitations themselves are being recognized for what they are. Rather than thought of as defining you, you're learning from a larger perspective that these things are not really a part of your identity. And so they seem to have to be let go, which the ego - who wants to cling to these as "identity", experiences as loss or death. I have experienced this a few times when we moved to a new city and I did not know why I felt like everything was falling apart.
Nevertheless, this gives way to an actual increase in identity, a removal of limitations, a freeing-up of borders and boundaries, and a sense of rising up to a higher level. You are becoming more of yourself and are opening up to awareness of discovering things about yourself that you did not even know were there. Choices and powers that you have that were hidden. Things you have the freedom and power to cause which you forgot you even had.
Eventually when you remove all blocks to awareness your unlimited underlying identity will be revealed. There is really no limit to who and what you are, buried beneath these blocks. So when you finally realize that you literally are unlimited, your identity now shifts away from littleness to the most magnificent expansive beingness. Your true identity as God's Son.