Is it possible to have declared bankruptcy with no creditors? Can you just spend all of your own money down to zero? Would you still be banned due to losing only your own money?
I think it would be very difficult to achieve, you would somehow need to convince a bankruptcy court to accept your bankruptcy, despite having no creditors.
If you spend all your money down to zero, then the normal thing is to just have your company dissolved and struck of the companies register. For which there is no consequences, you just tell the state your business is no longer operating, they make a note of that, and that’s it. Business dissolved, you get on with your day.
Bankruptcy is something you get into when you can't pay debts to your creditors.
If you have no debts, and thus, no creditors, you can't go bankrupt by definition. Of course, if there are government fees or taxes to pay, the collector of those becomes a creditor. You would want to formally close the business so that it doesn't accrue annual fees and force you to do more paperwork.