There are only three ways the US empire can alleviate its national debt.
Option 1: Austerity
The most common sense is austerity, where the US empire stops spending beyond its means. However, this is not feasible, since the current level of debt would require decades of less spending from consumers, the military-industrial complex, etc., which none of those parties would listen, plus the fact the American economy is primarily based on consumption.
Option 2: Export US Imperial Inflation
The second way is to inflate the imperial debt, which is what has been happening for some time now, with all the US toilet paper that has been printed for over the last decade. Although this non-war strategy should have worked, since the US dollar is still the World's reserve currency, where those nations shackled to the US dollar would theoretically absorb the US exported financial inflation suffering, thereby, allowing the US imperial economy to recover; the rest of the planet led by Russia, China, Venezuela, and all of the US empire's so-called enemies did and will not go along with that plan, as evidenced with them having sought and currently utilizing other alternatives to US toilet paper (i.e., gold, Euro's, cryptocurrencies, etc.) that the Federal Reserve and all of the other Global banking families can't directly influence.
Option 3: Start a Global War
The third and final way is have a human species ending global war, in order for the US empire to smash its economic rivals; reestablish a new global dominant currency; and restart the private central banking game all over again. Suffice-to-say, there are no winners in such a war of this magnitude, except the Power Okole, who have their own self-contained bunkers.
From the options above, the only sane choice is Option 1: Austerity, but unfortunately there will not be any domestic long-term buy in to that plan. The US empire is still trying Option 2: Export US Imperial Inflation. This has been going on for years now with no success due to the other countries not wanting to pay the financial price to maintain the US empire. That leaves only Option 3: Start a Global War. As seen with the US empire's goading of Russia and China, the Power Okole are starting to make preparations for this option in the near future. Since the planet is tired of American imperial global hegemony and will not sacrifice their economies, the rule of the US empire for all tense and purpose is over. Its just a matter of time now and to be very honest, the Power Okole don't care, since they can take their money and relocate to better areas on the planet or join Elon Musk to find another planet to live on.