Uncertainty about federal support for the Affordable Care Act (ACA) continues to threaten enrollment and stability in the nongroup insurance markets. Meanwhile, congressional Republicans are likely to continue their efforts to repeal and replace the law. But targeted policies could fix the ACA’s problems without sacrificing its gains in coverage, affordability, and access to care. These policies would stabilize the nongroup insurance markets, encourage insurer participation, improve affordability, and rein in premium growth. We divide these policies into two categories: those that should be implemented immediately to stabilize the markets and those that would strengthen the ACA for the long term.