Make sure agreements and cooperation with the west is successful and help the vast majority of the public in Iran realize that working with the west is in their interest. Over time it will help the left parties in Iran to gain more power and influence than the conservative and anti-west figures. Once you have the public support, slowly and surely push them to have peace with Israel. They used to be allies together. So it shouldn't be impossible.

But, we just did the opposite. The anti-west parties now have an easy story to tell: "We tried, they lied, we shouldn't work with them.". We added sanctions too. An economy under sanction runs by military and gives more power to the military, because only they have the tools to interact with the black market and bypass sanctions. Not the liberal, open-minded Businessman which is more likely to support more interactions with the world.