When your child is learning Qur'an, you can prepare a page like this. My son's book has 40 pages, so I draw 40 pages. When he finished a page, he painted that page on this table. He was very happy and excited to paint when he finished a page.
When he/she finishes learning book and starts reading Qur'an you should give him/her a gift. The pages that have star mark are also gift pages. You can choose small gifts for those pages to motivate them.
You can see my son's journey below.