People can't tell you how to stop being a narcissist. If someone tells you exactly what to do, you'll do that thing, and then stop. "I'm doing that thing now, so I'm not a narcissist!"
Your mind will simulate the most awful pain imaginable just to protect against changing your behaviour. You think your suffering is making you a good person, that by looking at the painful parts of your mind you are no longer a narcissist, but you're at the same place as you were before. You haven't changed your behaviour at all.