According to Osho, 'Who am I?' is not a question seeking an answer but a meditative device; the 'I' means nothing—it's a sword to cut the mind’s projections. Repeating it and rejecting all answers (neti neti) dissolves the knower and the question, revealing inexpressible, direct knowing: silent no-mind, emptiness, your original face.
Keep asking 'Who am I?' until every answer drops away and even the 'I' disappears, leaving calm, wordless awareness.