The bigger struggle over who will replace Iran’s Supreme Leader: he's 85 and is rumored to (again) have cancer. Iran has only ever replaced its Supreme Leader once in 1989, and it didn't go smoothly.
So, there are no certainties, but two names have been circulating: one was Raisi.
The other is actually one of the Supreme Leader's sons: the 54-year-old Mojtaba Khamenei, who's a mid-ranking cleric with hardly any public profile, working mostly as an aide to his father.
The son’s ascension would leave Iran looking quite a bit like a monarchy, which is exactly what the Islamic Revolution toppled in the first place. And that’d leave the regime with even less popular legitimacy than it enjoys now.
So for now, this power struggle will play out among fellow hardliners. And unless something in the regime itself snaps, the end result is unlikely to be any imminent change in the way Iran approaches its neighbors or the world.