Iran should strike hard. They cannot finish zionism but they can shake them. Target their infrastructures.
Also, Iran need to up their game in terms of intelligence. Assassination on our soil by foreign power is embarrassing. If the news I read is correct, then finding an Israel affiliated drone manufacturing facility near Tehran is another low.
Strike hard, bring them to the table. Involve Hazbollah, Hamas, Houthis at once.
Ground invasion is difficult since they do not share the borders.