It is easy to start a war. It is more difficult to stop one.
President Trump’s military intervention was too late to give victory to the mass protesters out to topple the government.
Now he is bombing, the protesters are more circumspect because the Revolutionary guards still seem to be in charge and have shown their willingness to murder protesters in large numbers.
The US claims to have destroyed the Iranian navy and airforce, but Iran is still able to direct missiles and drones against US bases and to offer a credible threat to shipping.
The US can carry on bombing as they find other stocks of weapons. They could try to bomb Revolutionary guards, though presumably they do not assemble in obvious locations. Where they blend into the local communities they gain some protection as the US needs to avoid civilian casualties.
Maybe the best the President can do is to bomb as much military and kill as many top officials as possible and declare victory. He will have to have destroyed most Iranian missiles and drones to greatly reduce the threats.
It would help if he can urgently establish a convoy protection system for tankers in the area.