There is nothing left after you hit rock bottom. When its the system that caused the rock bottom, you can't climb out of it via the same broken fiat system run by central bank policy.What may well happen is few years of austerity along with a nasty recession and bear market.
Your response is based on a misunderstanding. It is not clear whether you are speaking of what's called "national debt" or private debt and credit. For the U.S. there is currently no real national debt. What we call "national debt" is the sum of Treasury liabilities due to outstanding Treasury securities held by the Private sector. Treasury securities held by the Central Bank should not be counted in this sum. Treasury securities mimic debt instruments but they do not represent real debt. The U.S. must continue to issue Treasuries so long as it's productivity expands. And as long as the dollar is a reserve currency, the productivity of nations carrying out trade denominated in dollars must be included. What is important is rate of Treasury issue rather than the amount per se.There is nothing left after you hit rock bottom. When its the system that caused the rock bottom, you can't climb out of it via the same broken fiat system run by central bank policy.
The fiat system requires forever expanding credit. Debt is super high, and in order to resuscitate a nasty recession, you will have to expand credit some more. Who will take on more debt and how? You need prices inflating in order to keep it going and people borrowing more so that you increase the supply of money.
The things they could do in the 30's or even the 80's they no longer can because debt is already so high.
The USA isn't going to go 'bankrupt'. What may well happen is few years of austerity along with a nasty recession and bear market. It took Volcker just two years to kill inflation, which in those days was far higher and more entrenched than today. Nonetheless, such would crush all kinds of contemporary expectations about infinitely rising asset prices, or the God-given right to "quiet quit" and Zoom-meeting your way through a six-figure job.

For the U.S. there is currently no real national debt.
Again, we do not borrow, not currently. But of course they care how many Treasury securities we issue. And that, by extension means they care about our deficits! They certainly care about the interest rate on Treasuries. But if the care about whether the Treasuries get paid off, they don't understand Fiat money for a nation like the U.S. that has deep sovereignty over the money it issues.Do you mean to imply that our trading partners don't care how much we borrow or if it ever gets paid back?
Again, we do not borrow, not currently.