Again you can do both - you can cut these wasteful programs, you can have a well-funded government that's already well-funded with trillions of dollars, and then also reform healthcare all without raising taxes. Use your imagination.
That sounds nice in a perfectly spherical world but we live in reality.
Getting bogged down in line item spending is a trick politicians use to divide us. Net discretionary spending is only 27% of the budget, social security, Medicare, and military spending make up the other 73%. If you eliminated all discretionary spending, we’d still be running a budget deficit.
My imagination is indeed very capable of magical thinking.
However, if this was something that worked in the real world, we wouldn't be having this conversation because e.g. DOGE would have been successful.