How Should I respond to this from my stalker?

How Should I respond to this from my stalker?
This crazy girl has been stalking me ever since two years ago, she claims to have seen me near my bus stop when I was boarding to college. Ever since then I get messages from her on insta even if I changed my username and stuff, she found my yt account even though I don’t post anything and she follows me on my Spotify account even if my name is different. Every month she sends these stupid messages but I just ignore them but lately I am very annoyed and I want to stop this bullshit.
How Should I respond to this from my stalker?
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