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Show modal only if someone is new / reset after 30 days

I’ve added a modal to my site and I’m trying to get it to only show the first time a visitor comes to the site and no subsequent visits based on the cookie, but I can’t figure it out. Also, I’m self-taught, so I have a bit of a hard time understanding some of the js and custom code. Any help is much appreciated!

Here is my site Read-Only: