How do I keep building long-term security once I'm already saving well?

You are doing what most people only mean to do. You capture the full match and you invest with intention. That habit, repeated over years, is what real security is actually made of. Do not underrate it just because it has become routine. The danger at your level is not neglect; it is tinkering. When you are already on a good path, the urge to optimize can quietly become the urge to meddle, and meddling usually costs more than it gains. Keep your costs low, keep your investments simple, and resist the pull to react to every headline. Boring and consistent beats clever and busy over a lifetime. Once a year, raise your contribution a little, especially after a raise, and confirm your plan still fits your life. Then step back and let time do the heavy lifting. You have built the machine. Now your main job is to keep your hands off it and let it run.