"Our goal, in short, is a humane alternative to genocide."
The solution (if your point is reducing the population) is
Stop having children,
Legalize abortion,
Make all forms of contraception easily available,
End tax breaks for those with dependents (children).
If you goal is to reduce the population of the poor, educate the poor & help them rise above their station.

https://newrepublic.com/article/183971/jd-vance-weird-terrifying-techno-authoritarian-ideas