Children are like a hardmode tamagotchi for more than a decade with essentially no or very delayed economic payoff for the parents. Now an uncomfortable idea could be that you make the lives of (voluntarily) childless, reproductive-age people so difficult that just having 2-3 children is the easier path.

Not only could this have terrible side effects, it's also very much against the idea of finding good solutions via self-organization. Maybe there's deep biopsychosocial wisdom in the fertility crisis that we aren't seeing yet.