In places like Japan they have been trying that since the 1990s with the angel one program
The truth is if people want children they will have children and that their is not the social norms and community
That supports that endeavour because we only count GDP and economic activity as being valuable
Economists and politicians don't value the family and children because their value is not measured
If you were interested her is an article I wrote it's 10 minutes long it discusses the topic of Japan and fertility
If you wish to read it please read it if you don't wish to read no pressure
https://jonathanrileywriter.medium.com/why-japan-is-a-dying-society-fbfd5cfa02e6