Why did Hannibal, without suffering a single defeat in Italy, still lose the war?

This state of affairs can be explained by the fact that Hannibal did not know how to use his military victories in order to force the enemy to admit defeat. After winning the Battle of Cannes, he left Italy without finishing off the enemy. This enabled the Romans to recover. Then they struck back. Carthage lost the battle of Zamma, and with it the war. Rome did not lose the opportunity to deal with its enemy.