Build lots of cheap housing

Reducing necessary working hours to achieve a good standard of living (UBI, very high hourly wages, etc.)

Reduce opportunity cost of raising children by reducing national hourly wages

Subsidise daycare

Check women's periods

Pay a lot to new parents

Reduce legal red tape (cost of childcare, size of car seats)

Abolish NHS

Growth in the human population is slowing naturally through people's individual choices. We shouldn't interfere with this.

Declining fertility is a good thing because it will help us live within planetary boundaries.

Re-anchor people with the following article: https://en.wikipedia.org/wiki/List_of_people_with_the_most_children

Build rickety skyscrapers in huge numbers

Tax those with no or few children

Extending fertility windows of women

reduce social stigmas around polyamory and having children with multiple people

The population has grown due to the explosion of energy made available from fossil fuels. If we're reaching the limits of this energy expansion, then it's natural that fertility will decline.

Policy levers are effective at raising fertility

Artificial wombs

build lots more suburban housing

Get rid of all regulation restricting supply of energy. Rely only on institutions of common law.

Get rid of all regulation restricting supply of childcare. Rely only on institutions of common law.

Get the Church of England to ratify the conclusion of their 1908 and 1920 Lambeth Conference. I.e.: They should strongly discourage contraception

Social praise for those who have lots of kids

Extending fertility windows of women

Get rid of all regulation restricting supply of healthcare. Rely only on institutions of common law.

Get rid of all regulation restricting supply of housing. Rely only on institutions of common law.

Reduce university subsidies

Be patient. In the medium-run, evolution will win.