It is currently unknowable what biological processes create each individual conscious self. It might be true that our brains acquire different conscious selves through our experiences in life. Our experiences might change the connections in our brains such that that the conscious self becomes completely different.
At each moment each of our conscious brains create a particular conscious self. I find it much more than just an impossible coincidence that I am experiencing my conscious self right now. Time is likely infinite. The math doesn't work if I only get one life. Requiring each conscious self to get only one chance and not allowing it to ever return is not necessary. There is no reason for that.
Consciousness is amazing and I'd consider it impossible if I didn't know it was possible. But by being conscious I know consciousness is possible and all evidence is that consciousness is a natural process of the brain. In nature, once something is proven possible that same something is assumed to happen again. Consciousness isn't special. We are all likely reincarnated (no memories from past lives since there are no souls and the previous brains have died) an infinite number of times though infinite time in what is likely our huge multiverse.
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