Secular pronatalism as an ideology is new to me, but obviously the main limiting factor in fertility rates globally is just a mismatch in the lifestyle of the modern luxury-expecting freedom-enjoying individual vs the self sacrifice needed to do child raising. I would say a significant part of that is financial and time-related, both things which have obvious political, not ideological, solutions. Fighting the ideology of individualism with an ideology of self sacrifice did not work for climate change and will not work for pronatalism.

I often joke to my peers: it doesn't matter what I invest in, my best financial decision was buying a house, my worst financial decision was having kids, the rest is just screwing around in the margin.