The previous agreement ended with the US killing the Ayatollah and other senior leaders, promoting regime change, and demanding unconditional surrender. Venezuela capitulated to the US and is now under US control. If Iran's leadership's goal is to survive and to maintain control of their country, they're likely to continue hostilities until they re-establish a deterrent. Worked for the Taliban in Afghanistan.

If you believe the US military, Iran has already lost the majority of its capital-intensive armaments and its nuclear program and its senior leadership. This means there are fewer strategic holdings now at risk. Iran knows it can't be effectively invaded. The regime loses control in two scenarios: (1) internal regime change; (2) diplomatic capitulation to US demands. Waiting out at least US mid-terms while continuing to threaten the strait and neighbor's infrastructure is quite possibly Iran's best decision tree path from the point of view of the regime.