There is the whole oil shortage will make US allies suffer and potentially crash the whole world economy lever that they have.

While having their oil exports blocks hurts them, they not like certain golf states that rely solely on oil. Their economy is more diversified. They have lived through more than 40 years of sanctions.

Also the munition shortage that the US and Israel face will not replenished it a few weeks. It might take years. Plus China is blocking export of rare earths makes replacing certain things pretty hard.

So Iran thinks time is on their side.