https://usafacts.org/articles/how-much-of-the-federal-budget...
> The US government spent $6.2 trillion in total in 2023, with $1.7 trillion on discretionary spending, $3.8 trillion on mandatory spending, and $659 billion on net interest. Discretionary spending includes funding for defense, education, transportation, and scientific research. Approximately half of federal discretionary spending is allocated to defense.
So I suppose I would agree with your assertion that there is a lot to cut if we're talking about cutting defense spending and interest on the debt via more taxes to pay down the debt (to reduce forward debt servicing obligations). Can't keep cutting taxes for the wealthy with the expectation that is going to reduce spending or increase overall federal tax income, as the evidence shows it will not.
Per the link you provided https://usafacts.org/government-spending/
2024 - $6.8 trillion in spending
$1.3 trillion Defense, $323 billion of which is veteran support (pensions, retirement, medicare, etc).
Discretionary spending is a misnomer that assumes all of the other spending levels just have to be maintained as is, are without fraud, run efficiently and impossible to reform.
Cut 20% across the board from every agency for starters (including Defense). That gets us back from $7.5 trillion to $6 trillion. Then do it again 2 years later and get us back to $4.8 trillion. Then do it again.
States have limited budgets and must balance it all the time. Companies as well. There's no reason the federal government cannot do exactly the same thing.
"Wealthy people" didn't cause the US government to spend an extra $3.5 trillion a year over a decade ago and this idea of raising taxes more on those people wouldn't even begin to address the spending problem.