You may be able to buy some EVA foam in the correct color (or a near match) and pull the old EVA foam off and glue some new back on in the most heavily worn areas.
This would be a real job to do "nicely".
Some of the professional board repair folks could do it but it might be quite expensive.
To the best of my knowledge Starboard does not offer complete new EVA deck kits.
Might be time for some new boards.
If it's only in small areas, you can for sure patch it.