What’s a cutting board?
Literally, a place to cut. A thing to protect that which you don’t want to cut. You cut on the cutting board so you don’t cut on the counter. So your knife does not become dull.
The board exists to be cut upon.
A steel knife will cut wood. Marks will show. Over time ... a board will show wear.
If you bought the board from me, just return it to me and I'll restore it. No charge.
If you would like to restore your board yourself, you just need a random orbital sander and the 5 grits of sandpaper that I use: 80, 120, 180, 220 and 320. Work through the grits, taking off the oily top surface of the board, and taking the knife marks away as well. In 8 minutes, your board will look like new.
Re-oil it, rub it down with Mrs M's Board Butter, and you are ready for the kitchen!
Here's a picture of a board that I made for the younger Mrs M - and her Mr M, for that matter. They are both a wiz in the kitchen. I restored their board for the 2nd time in 2018, and it was 5 years old at the time.