Allow kingdoms to invest in lands incrementally. That way at later stages you don't have to bank in pots or allies, which cause a loss when dropped or sold. This makes sense when your next land is 500b.
I'd like to see a little more effort, possibly add a cap? Or a minimum balance to "invest" for example
The only cap should be the price of the land. No need for another. You also shouldn't be able to bank anymore after you have explored all lands forcing to invest in pots or ally's.
No support. It's not supposed to be easy. Plenty of people out there have managed hflc, I'm sure you can too. Maybe you can get your mommy to hold your hand though if it makes you feel better.