Help with Selucids

[Magraev]

You should be capable of generating a positive bankaccount. Use those money to bribe any would-be invaders before a war breaks out. This is a good way to pacify the parthians and your other neighbors. Just make sure you have a diplomat ready when they approach. You have to keep seperate field armies in Seleucia and the west, since reinforcements won't arrive in time from your central areas otherwise.

And you have to kill the egyptians quickly even though it will be painful. Once you have the three southern egyptian cities your worries are over (except for squalor).

Watch out for jerusalem btw - it seems to be permanently rebellious.