Hmm,

maybe make bots that constantly loop a repeatable quest?

Something like https://zomg.fandom.com/wiki/Buh-durn_Garlic or https://zomg.fandom.com/wiki/Kloked_Out
gives 10p + 2 orbs.

will require building your charge level up enough for each quest, once you get far enough you can do better paying ones like https://zomg.fandom.com/wiki/Endlessly_Into_the_Sea which is 20p + 4 orbs.

Far as I can tell there is nothing thats really OP in zOMG sadly though, that we can abuse to pay lots.