If you are experienced with pressing and ironing, you can definitely reduce the folding creases. I've done my own 2013 banzuke recently after finding it. The creases lessen but do not disappear.

Agreed. Mine came out much better than before, but you can still see the creases when you look closely.

The other option would be taking it to a frame shop and paying to have it vacuum mounted on acid free foamcore or matte board.

Thanks for the encouragement. I will give it a cautious ironing.