I doubt that Iran will retaliate in any way if Nasralah is dead... At most you can expect some militias in Iraq, Syria and Houthis launching some missiles towards Israel that won't change anything. What happened to the hundreds of thousands of rockets and missiles that Hezbollah had?
In the last few weeks Israel is absolutely destroying Hezbollah and to me it looks more and more like Iran is ready to sacrifice them to get on better terms with the West. Their new President Pazeshkian hinted how they are ready for a new nuclear deal, how they support Ukraine's territorial integrity etc. Hezbollah are the useful idiots that will be sacrificed like a used napkin.
They might not retaliate but I don't think it will be because the president has any say in the general direction of the country. JCPOA will expire in January 2026 and Iranians' whole strategy has been to drag the negotiations until it expires and the snapback mechanism (an automatic mechanism predicted in JCPOA) is not applicable in the security council to bring back the harshest sanctions by all members of 5+1 (regardless of the fact about how that will be actualized now that Russia and China are very unlikely to follow U.S. unlike how they didn't veto and did obey the security council sanctions during Obama years). Because of this, whatever the new president has been saying about the Iran deal and nuclear negotiations, the last more hardline president was saying as well, as that is the general doctrine and it hasn't changed. I think they are just waiting for the current supreme leader to die or be replaced due to illness to declare his fatwa about nuclear weapons null and void and declare themselves a nuclear power without there being any deal in place which can put them in jeopardy of the security council being able to automatically impose multilateral sanctions on them.
Likud, Otzma Yehudit, New Right, United Torah, and in general Kahanism, revisionist zionists and the settler politicians have always been a fan of full-on war with Iran as they see them as the main obstacle to their goal, i.e. full occupation of Gaza, West Bank, etc. and complete ethnic cleansing of Palestinians into the Jordan valley and Sinai. They also know that they can only achieve this with full U.S. support. Therefore, right now, fully aware of what the Asia pivot by U.S. means for the diminished importance of Israel and the ME region as a whole for U.S. strategic thinking and military and intelligence investment, and the limited capacity of U.S. in supporting a regional war thereafter, seemingly they see a limited timeline for forcing U.S.' hand through the influence of their lobbies and also the semi-organic soft power they wield in U.S. government, institutions, intelligencia, intelligence community and finance, to enter a full-on war with Iran, esp. as the calculation might be that the incumbent (Biden), in case of entering a new war, will not transfer an inconvenient amount of negative consequences and blame to Kamala Harris in the election. The urgency, from their pov, is amplified if we add the January 2026 date for a nuclear Iran to the picture. I name the parties and currents who think this to underline the fact that although this is the majority view in the Israeli political sphere, some of the secular zionists and all of the liberal zionists do not think this is worth ruining Israel's image and making it a pariah state for (as the harsh attacks and mass murder is designed to entice but has such discommodious byproducts). They propose that the Iranian regime can topple itself easily through a combination of sanctions, intelligence work, polarization and ethnic strife, leading to a color revolution (CIA, MI6 and Mossad backed Farsi t.v. stations are the go-to media options [VOA, BBC, Iran International respectively] for almost half of the Iranian population). For the hardliners this is a liberal dream that doesn't take nuclear bombs into the equation.
So putting two and two together (the twos here being the two paragraphs above), one can see why Israel is trying to entice Iran as hard as they can to hit them hard to guarantee casus belli becoming justified for U.S. establishment and their public opinion operation, and why Iran who is trying to wait until 2026 to potentially become a nuclear power and through that deterrence force an acceptance of its reintegration into the banking and finance system of the world, is trying to avoid a war scenario.
EDIT: I don't know how consistent this is with the state of stockpiles and manufacturing capacity wrt the Russia-Ukraine war though.