How do i upgrade my bank?

[whole briar]

i don't find a command that upgrade your bank

[velvet knot]

You can upgrade your bank via the “Bank Note” item.

Can be bought from the /shop or /market

[normal cliff]

To add to what AppleTumu said, you can also increase your bank space by leveling up. (You can level up by running commands.)

[whole briar]

Thanks