The US' limitations in its ability to project power have been exposed. Having American bases in the middle east has been shown to be nothing but a liability for host countries. And Iran has proven that it can withstand anything the US is willing to throw at it, and hit back hard, over a relatively prolonged period.
And Iran has shown that its constitution is strong and power succession is effective even after a massive decapitation strike. There was seemingly zero turmoil, control appears to have been maintained without issue.
And Iran's non nuclear option of controlling the strait has been tested andd shown to be highly effective.
And Iran has gained significant operational experience with its massive stores of drones and missles.
And the US has lost multiple billion dollar intelligence installations in the region.
And Americans have been made aware of the Israel lobby like never before, and Trump is in a very difficult position heading into the midterms.