Iran is not David in this case. They’ve shown that their drone warfare is just a little bit under what the US military can provide. Remember that they destroyed a quarter of a trillion dollars radar installation. And the US has spent billions on munitions. The US can’t actually keep going in this war.
I once compared the historic GDP values, and IIRC if Iraq-vs-US in 2003 is 1x baseline, then Iran-vs-US today is 7x. Plus Iran (today) has 2x the population and 3x times the land area than Iraq (today).