Here are policies that are most likely to destroy your country:
- Nationalized agriculture will quickly cure overpopulation.
- Concentrate your economy in the hands of a handful of mega-corporations. The rich and powerful get significant benefits paid for by the working class.
- Increase the cost of housing. If a condo is less than 20 times the annual income, are you even trying to kill your country?
- Increase the cost of child care. If women can work and have children, you are just a feminist.
- Privatize education. Only the wealthy can afford to get the best jobs. This kills social mobility, which kills your population growth rate.
- Long-term economic depression. People have children based on relative terms, not absolute terms.
This is Korea. These are the policies of both North Korea and South Korea in one list that have destroyed the Korean nation.
If you instead want to build a society with stable growth and economic opportunity, do the opposite of these.