I’ve discovered recently that there is an easy way to cover or at least hide for a time the scuff mark or the colour coming off your shoe. ( lot of shoes and sandals have the colour on top and a white colour underneath)
If you can get vaguely colour coordinated permanent sharpie or nikko pens you can do a touch up. Is it perfect no but it could probably get you through to wear them out for another season.
My red sharpie matched perfectly to my red ballet flats heel section.