Serious answer.
A regime is people, money, and weapons. Take all three away.
People. The supreme leader, the Assembly of Experts, the IRGC command, the Basij command, the intelligence ministry leadership. Named targets, found and killed. The last Basij chief was killed in March. The regime named a new one in August. He gets the same treatment, and so does the next one, until nobody wants the job.
Money. Kharg Island handles around 90 percent of Iran's crude exports. We already hit the military targets there in March and are blockading the rest. Finish it. The regime cannot pay the IRGC, Hezbollah, or the Houthis with oil it cannot ship.
Weapons. The nuclear sites, the missile production plants, the drone factories, the launchers, the navy. Everything that reaches past Iran's borders.
That is a few weeks of air and sea power plus a short ground component for the targets bombs cannot reach, which is what Israel asked for in March. Then you leave, after telling whoever is left that rebuilding any of the three gets the same treatment.
Nobody writes their constitution. Nobody polices their streets. The Iranian people decide what comes next, which is more than they have had since 1979.