If you start making single people subsidise expenses for larger families, they will no longer seek to be single, and if you can give them tax breaks the more kids they have, they will no longer try to horde money in a childless marriage.
But they also need to provide incentives for keeping businesses local and hiring locally. They need to bolster local commerce and discourage women entering the workplace (no more maternity leave, this will prompt women to stay home and care for the kids so more men can enter the workforce. And penalties for staying single will see women vying to get hitched quick to avoid paying out expenses while they are working).
I hope for the world's sake that Russia can do something about it's birthrates, but afaik no nation has been able to reverse declining birthrates.
It's really simple:
Kill off the welfare program for single mothers.
At fault divorce.
Tax incentives for larger families
If you start making single people subsidise expenses for larger families, they will no longer seek to be single, and if you can give them tax breaks the more kids they have, they will no longer try to horde money in a childless marriage.
But they also need to provide incentives for keeping businesses local and hiring locally. They need to bolster local commerce and discourage women entering the workplace (no more maternity leave, this will prompt women to stay home and care for the kids so more men can enter the workforce. And penalties for staying single will see women vying to get hitched quick to avoid paying out expenses while they are working).