What's to fix?
There's some surface wear on the crank. The only problem is that unlike frame scratches, you can't associate specific memories to each mark. So just consider them as general reminders of the years and great rides you've shared.
BTW - my first road bike's cranks (Campy Record form the late 60s) have the same wear marks, except that the ones made by the shoes are over 1/16" deep at the center.
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