Iran’s new Supreme Leader has to regain control over the matters his father had engaged. Some of these are obvious, but others will have been collected up by the former leader in the course of the war mongering of his dictatorial regime.
These are added up into the collective power that Iran has and uses to wield influence in the same region and across the world.
It may or may not include the terror elements in places like Gaza and Lebanon. These are less easy to handle and Mojtaba Khamenei is likely to decide against maintaining them as power bases, but invite their support nonetheless.