| Either a new nut or....
Carefully adhere masking take to both sides of the nut.
Drop some baking soda in the worn string groove.
Add a drop of super glue to the baking soda; it reacts with the baking soda to form a bone-like substance.
Remove tape and use a roundwound string to 'file" the groove back to its proper depth.
If needed, VERY carefully sand the sides of the nut to restore the original front and back contours.
I've only used this trick to fill a slot that's cut too deep, but it ought to work in this application too.
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