Fixing our birth rates will inevitably involve tackling both
The main cause of lower birth rates has been birth control: increased, more effective, and greater access to it. https://zerocontradictions.net/FAQs/overpopulation-FAQs#why-birth-rates-declined
I proposed many ideas for fixing fertility rates here: https://zerocontradictions.net/FAQs/overpopulation-FAQs#boosting-western-fertility
The main cause of lower birth rates has been birth control: increased, more effective, and greater access to it. https://zerocontradictions.net/FAQs/overpopulation-FAQs#why-birth-rates-declined
I proposed many ideas for fixing fertility rates here: https://zerocontradictions.net/FAQs/overpopulation-FAQs#boosting-western-fertility