If Iran's 10 points become the basis of the peace, it ratifies Iran's sovereignty over the strait, at which point they can raise the price. It will be years before alternative routes devalue control of the strait, during which time Iran can siphon a lot of money out of passages taxes.
One thing I've not heard much discussion of is alternative routes. In the early days of this war there were discussions i of pipelines but it tapered off pretty fast