Step One: Review Article I, Section 8 of the U.S. Constitution, which describes EVERYTHING that Congress is empowered to spend money on. Notice that there are no "individual" items on the list. No housing subsidies, loan guarantees, no education spending, etc.
ELIMINATE all spending that violates the Tenth Amendment. We are halfway there.
Then, make Social Security separately-funded and self-sustaining. The amount going out MUST equal the amount coming in. That will require "means testing," so that people who already have assets and private pensions will get LESS from Social Security, while those who actually must rely on it will have their benefits remain the same. Believe it or not, the wealthiest segment of the population is retired people. Go to Florida and the resorts along our coasts, and see all the geezers driving high-end luxury cars and SUV's, "vacationing" in their coastal million-dollar condo's. It is insane that they are getting generous SS checks every month; clearly, they don't need that money. (parenthetically, I include myself in that group).
Finally, pass a Constitutional Amendment authorizing a compulsory national healthcare program in which the Federal Government owns all the hospitals, clinics, labs, etc., and directly employs the doctors and other healthcare providers.
Establish a separate Federal Payroll tax to fund healthcare, which will be "free to all." The savings realized by eliminating the billions of dollars in insurance overhead and profiteering will allow healthcare to be funded easily by a modest payroll tax.
In summary, I don't support any of this, and it would implode the economy, but it would balance the budget.