My opinion is that doing all those things won’t magically fix the birthrate. Truth is that the more educated a country is, the lower its birthrate is. Countries like Korea and Japan have the lowest birthrate but also the highest literacy rate and most educated populations. While countries like Afghanistan and several African countries have high birthrate but also poor education levels and high infant mortality rates. More educated people realize that having kids sets them back from achieving their goals with the time and energy it takes to raise them. And the ROI isn’t even guaranteed because kids move away once their adults and aren’t necessarily going to take care of parents in their old age.