Iran said that the US will regret this action forever of what they do. Iran has got a huge oil reserve and again, this is happening just like what they did with Afghanistan and Iraq.
I don't think Iran expected an attack from USA so soon, so they were caught by surprise, and the lack of innovative and immediate actions from their side right now displays that.
Everyone didn't expect that the US will do that attack. When it was thought that they're only telling things but no, they've joined already with the Israel for this war. On the other hand, Iran has got Russia, China, North Korea.
It seemed weird to me Iran would threaten that way the United States after Trump announced they alledgedly destroyed several of their underground nuclear facilities, to be honest.
As it stands for now there is little to nothing Iran can do in order to retaliate those attacks and I have already seen some news about people from Iran fleeing to Pakistan and people in Tehran taking refuge in their underground basements and avoiding to go outside because of the possibility of an air strike in the capital, which would be very serious. In the mean time, there are people in the United States which are not even aware of the war going on and go to their jobs and go to sleep as if nothing was happening. Iran is full of hot air and I am sure they regret to getting nuclear bombs faster during the administration of Biden.