A few suggestions:
-Try checking your lighting (try natural light from outside or a light source from another angle)
-Really shiny bald spots tend to trick the software
-Make your eyes are open up really wide on your selfie.
-Make sure you are filling in the exact same name as shown on the Government ID
-Please make sure your ID card hasn't expired yet (Check the date).
-You must be 18 to pass KYC verification.
-Make sure the pictures are sharp.
-Try to make a picture from a slightly different angle (higher/lower/more to the side, more to the center, further away, closer by).
-Try to make new pictures even if they are sharp.
-We have seen situations where it took people 10 times before it finally got accepted, so try a few more times.
-You can also try different documents (So a ID card or passport instead of a drivers licence for example).
Let us know if these suggestions didn't work by creating a ticket at: https://support.splinterlands.com/hc/en-us/requests/new/
In first instance you do not need to enter any pictures of your ID as a attachment to that ticket.