Keep reading the Upanishads. They are full of paradox. Life is a paradox. You are both limited and in time and this True Self both/and. You "incarnate" in every moment.

Who is it that is born in this moment? Who are you? You alone have access to your direct experience.

A great danger in taking on a doctrine of "no ego" is that you may use such a doctrine to push away your own experience. The way of the Upanishads is investigation, not denial.

Find out for yourself with such capacity as you have right now. Forget rebirth. You have no experience of that right now. Except. Except perhaps the going to sleep every night and coming back into dream and then waking. Notice that many Upanishads focus on deep sleep, dreaming, and waking. Investigate these first.