Yes, All you have to do is these five things, and you will defeat the covert narcissist for sure:

Deflect everything the narcissist throws at you, as their words are nothing but projections. Remember, their accusations and criticisms have nothing to do with your truth. Recognize them as lies and refuse to let them affect you.
Disengage completely. Whenever the narcissist tries to draw you into an argument, resist the temptation to explain or justify yourself. Cut off all engagement.
Reject every request or attempt by the narcissist to reconcile with you. Maintain your boundaries and refuse to be pulled back into their toxic cycle.
Keep thorough documentation of every interaction and incident. This documentation can serve as evidence, revealing their true nature when needed.
Make a conscious decision to become the best version of yourself. Strive to be the person the narcissist never wanted you to be. Focus on personal growth and self-improvement.