Try to reach your supervisor. Click on a connected group of 3 or more items to remove the items just before your worker. Move your worker closer to the supervisor and again remove blocking items.
Try to remove all cards by combining 2 cards to a total value of 13. A king is 13 points and can be removed on its own, a queen is 12 points, a jack is 11 points and an ace is 1 point.