How are you calculating this? The full-year deficit is running at less than $1T... You aren't counting it when Treasury rolls maturing bonds over into new debt, are you? That's normal and irrelevant.
https://fiscaldata.treasury.gov/americas-finance-guide/natio...
There's a few things worth mentioning, since after all that is still a big deficit.
1) Debt service costs are over $1T annually, as the end of many years of ZIRP finally starts to bite. There's no guarantee that we return to lower rates in the future, but it's likely, and that will reduce debt service burden over time.
2) Deficits are calculated inclusive of the costs of debt service, but do not include the impact of inflation on the public debt (which is substantial right now).
3) Deficits can absolutely be sustainable. The economy (i.e., GDP) grows over the long term, and the tax base grows with it. GDP is around $23.3T, and assuming long-run 3% growth, that would mean deficits of $700B are sustainable.
Overall the fiscal picture is not great, but anyone acting like there's an acute crisis is probably doing it for political reasons.