Drop natural population growth toward zero. Import one million low skill, very low income persons per year.
Welcome to the non-merit, non-point based immigration system treadmill of never getting anywhere because you perpetually flood your system with cheap replacement labor.
Tens of millions of Americans moved from the middle class into the top two economic tiers since 1970. And we replaced them with vast amounts of low cost imported labor. If you keep doing that, you will not see meaningful wage growth at the median, you'll only see it in the top tiers.
Most other developed nations are once again correct: the US should move to a common sense points based immigration system. We could merely exactly copy Canada on immigration, and that would dramatically improve the conditions for workers at or below the median.