From all I've read or heard about birth rate rise the measures that sociologists see as the most effective are: provide cheap housing and pay much more to families (i.e. mostly to women) with children to compensate for their loss of potential career. The latter has a twist that the payment should start (or significantly increase) with the birth of the second child (and continue to rise with the third etc). Paying for the first child does next to nothing to the birth rate. Some countries already do that, but the amount of money poured into this should increase by order(s) of magnitude to achieve the replacement level. Or we can go full medieval - completely deprive women of education possibilities and financial independence, like Taliban does.