Iran’s first concern is their own existence. They will not do anything that puts that in jeopardy until they are ready.
Iran helps Hezbollah with money and weapons.
Anything they could give the Palestinians would be blocked, stolen or destroyed. The only thing left is a direct attack on Israel. That will come. They have to answer Israel’s blatant attacks on them. The Iran hardliners demand it. As I sad, they may be developing nukes, they are obtaining weapons and strategic help from Russia. Russia is physically in Iran right now building radar jamming equipment. This is all to prepare for Iran’s very very hard attack on Israel. All scenarios are being discussed with dry runs.
It will happen. The world can’t wait.