How would you deal with a narcissist?

So I left my narcissistic ex 45 days ago, well since then she won't go away, I've even told the police but they're as useful as a chocolate fire guard, I'm at a loss and have no clue what to do about it has anyone got any ideas what I can do apart from the obvious block and report. (She just makes new accounts)

For context she lies has told everyone I'm a nasty person I'm a head f**K I'm evil and I lie, she hits me in my privates. She tried to stab me with carpet sheers and she put a piece of paper in my door so I'd get burgled, and now she is harassing me online, I have literally no one who can help me, and I'm at a total loss. Any idea would be welcome.
How would you deal with a narcissist?
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