That's how I got promoted, found that I was out of my depth (promoted to my level of incompetence), lasted two years, and I start a new job in a couple of weeks

That's how I got promoted, found that I was out of my depth (promoted to my level of incompetence), lasted two years, and I start a new job in a couple of weeks, back to the same role I was doing prior to the promotion but at a different company. The person that's replacing me, is basically the me of two years ago. So that's going to end well... I have learnt a lot in the last couple of years and I reckon my own 'level of incompetence' is somewhat higher as a result.