If Iran really wants to grab Israel's attention... then work internationally to have an international response to the "crisis".

Ask China to have representatives, perhaps diplomats or even provide a few aid ships themselves to Gaza. Ask Turkey to provide some aid and help with the distribution. Iran could ask African governments for assistance. Get a small international flotilla coming in to Gaza with aid. Have the U.N. inspect everything to ensure that it is all non-military aid coming in... but don't let Israel play any role in distributing it or helping the people medically, or providing security. Have Lebanon and Jordan help out. :>)

Something like that would embarrass Israel and isolate it further... and would put an exclamation point on the embassy attack.