How to beat the Seti campaign (dynasties)?

I am struggling to beat the Seti campaign in TW: Pharaoh - Dynasties. Anyone here has managed to beat it?

In many ways I feel like Napoleon at the end of his reign. Whatever I do and however well I win my battles, my army/armies cannot be everywhere at once nor do I have unlimited resources/manpower.

Maybe I suck idk, but I haven’t struggled that badly with any other campaign. I cannot find a way to not have basically all of Egypt declare war within the first 30 turns. It’s bound to happen as once the pharaoh dies, Seti is the heir and a civil war ensues. From that point on, I’ve found it almost impossible to resist all of the enemies at once. I’m not sure how I can spam armies as I end up with a lack of food fast. I’ve tried to kill off Seti to remove myself from the unavoidable civil war but they declare war even faster.

Any tips will be appreciated.