I recently discovered some of Sri Ramana Maharshi's work. It turns out that he wrote a brief book with a title like my own first nonfiction, "I am". His book was called "Who am I?". When you run out of answers to that line of questioning, you get close to 'you'. I also remember seeing the YouTube video, of Doshin Roshi from Integral Zen, at Findhorn. The date was August 2016. To a group of seekers, Doshin says, "Who are you?" It's ~40 minutes into the video.
Michael