The easiest way is to simply ask the banksters for our $16 tillion back. But since the banksters rule the world, I guess we won't get that!
Social Security Means test benefits. If you made twice the median salary (approximately $33,000) in your last 5 years of employment, you get reduced benefits. Eliminate the income limits. Why should you stop paying in just because you made more than $106,800? There are no income limits on medicare.
Revenues Legalize and tax marijuana. That may be $40 billion to $100 billion in new revenue! Legalize and tax sports betting. Although only 35 states currently allow "gaming", that number is sure to grow. Adding $50 million to a state budget will help to eliminate the need for federal dollars.
Economic Growth A natural gas based economy. Get fleet vehicles and 18 wheelers running CNG. Get Detroit making those vehicles. And export LNG to other countries (USA natural gas is $2.76 but it can be liquified and sold much higher.
Homeless Make shuttered schools into shelters. They have showers, gyms, bathrooms, cafeterias, computers, and plenty of room for beds. Laid off teachers can re-train these folks in the Cheapo Groovo system, which has no layoffs or outsourcing.