The main problem of most developed societies is horribly low fertility rates. Lot of women pick very long education path and then career thinking about having children only in their mid 30s… When their fertility is mostly gone.
I think education system for women should be tailored towards different things than men. Teenage girls should have better knowledge of psychology (especially child psychology) health, childcare ect. so they are well prepared to build strong stable relationships and start families when they’re actually fertile. I’m not talking here about giving up on career of course, it’s a personal choice, but I wish the education was complementary for both genders (so couples benefit from different specializations of each other) rather than uniform.
The reason for low fertility rates is in large parts due to capitalism. I want at least one more child, but it is too expensive. We need to get a bigger apartment, which is prohibitably expensive. Want to stay home with the child? Too bad, both parents have to work to make the economy work. If you want higher fertility rates we just have to make it easier to become a parent through systemic changes, and lots and lots of reforms helping parents
I’m not saying you’re wrong - there are always people who have financial constraints. I’m just saying that there’s also a lot of people who could absolutely afford larger family but for some reason they choose not to.
Then the solution is still to make those that actually want to able to. This is anecdotal, but I know several people that delay or do not get children due to their finances. That is in Norway, with the best or close to the best support and security net for families. Society is not made to have children, and if you dare go above two children, then you will have a lot of disadvantages. So the practical maximum for most people is two, unless you live where there is almost no jobs, on top of that not everyone gets children. The practical maximum is due to car size, home size, budgets etc. Do you want your child to own a home some day? Then you have to pretty much make sure they are able to financially and start straight away, which is not something they will be able to themselves. All these reasons contribute to there being born less than two children per woman.
Society has a few choices to maintain the population