Uhm, I've already explained it. But I'll give a brief sketch:
1. Raise retirement age for social security benefits to 70, increasing at a modestly faster clip than the currently expected increase to 67. By 50 years from now when it actually fully phases in, I don't think it will be a particular hardship to 69-year old workers.
2. Overhaul Medicaid, notably switching to a block-grant system and focusing on providing preventative and primary care and avoiding lots of the current snafus with emergent care.
3. Overhaul Medicare in the context of comprehensive health reform. This would include but not be limited to: increasing Medicare's bargaining rights with both drug/device companies and doctors, changing incentive structures from fee-for-service to capitation/bundled care/integrated care, adding some level of means-testing on premiums, etc. In the meantime, overhaul healthcare for everyone else by pushing cost-sharing with patients, increased competition in the medical sector (notably liberalizing the profession and allowing non-doctors to perform more procedures), changing the insurance system, tort reform, blah blah blah. This will also help Medicaid costs.
4. Look carefully at defense spending to find major areas of spending growth and crush them. Notably, increase Tricare premiums and keep military salaries from increasing at a far higher rate than overall wages or the economy. These personnel costs will drastically decrease the long term budgetary strain on the Pentagon. At the same time, axe unnecessary procurement programs and deployments so long as they do not impair readiness.
5. For regulations in general, implement stronger monitoring systems to fully address the costs and benefits of proposed regulation.
I have other policy recommendations, but they'd largely be revenue neutral (e.g. tax reform) so I won't detail them here. The point is that our major drivers of deficit growth are the above issues (notably 1-4), and they can all be addressed without crushing discretionary spending and letting entitlements and defense squeeze out everything else. These will - in the long term - save a lot of money and greatly decrease both deficits and debt, but won't cause a huge immediate contraction as consumption/etc. drops off a cliff. They actually deal with the
problems rather than the symptoms. Symptomatic treatment can be temporarily effective if you're at death's door (like, say, Greece), but if you actually want a cure, you should fix the root cause of the problem.