Buffing or polishing epoxy
It is possible a VERY SKILLED person with polishing skills could use a 3M product called “Finesse-it 2”, which is a high gloss polishing compound, and could remove scratches and leave a high-gloss. However, if you don’t know what you are doing, you could use too high a speed to polish and would cause the epoxy to smear or too low a speed and cause the epoxy to become cloudy. We suggest testing this first. Polishing is something that takes skill and experience to achieve good results. You do this at your own risk.
Alternately, after years of abuse you can lightly sand the surface and pour a new coat of epoxy and it will look brand new again.