Once Israel manages to deal with the impoverished militant groups in the tiny besieged Gaza Strip then it can think about Hezbollah maybe and if it is still alive then it can think about Iranian groups in Syria and Iraq and Houthis in Yemen (who all have missiles that can reach Israel)
Then if by some miracle it still wants to fight with Iran, bring it on.
Israel's best chance to attack Iran was in the early 2000s once news of Natanz was leaked by the terrorist MEK. Back then Iran didn't even have missiles that could reach Israel or any modern air defence systems. But they blew it and now Israel is surrounded by a ring of fire and Iran has nothing to fear.