Why does imposter syndrome get worse as I succeed?

Every step up makes the fraud feeling louder, not quieter. You keep expecting to reach a level where you finally feel legitimate, and it keeps not arriving. That is the strange cruelty of this, success feeds the fear instead of ending it. Here is what is actually happening. Imposter feelings do not come from lacking ability, they come from measuring your insides against everyone else's outsides. As you rise, the rooms get bigger and the comparison gets sharper, so the feeling grows even as your competence does. It is not evidence that you are a fraud. It is just a broken measuring stick. Stop waiting for the feeling to go away, and start collecting facts instead. Keep a short list of things you have actually done and delivered. When the fear speaks, read the list. Real people were helped by real work. Feelings are not facts, and the record is on your side.