Assuming no selective-abortion shenanigans, every child you have is expected 50% male, 50% female (barring e.g. unusual men who only produce sperm of one gender—I think that exists but is extremely rare), so there's no possible strategy that leads to an uneven gender split, probability-wise.
But I think there were selective-abortion shenanigans, and that the policy was effectively in response to them. If we assume each family wants, as its first objective, to maximize the number of sons, and, as its second objective, to maximize the number of daughters, then each selective-aborting family would have exactly one daughter followed by one son under such a policy.
Unfortunately, you'll be quickly rate limited by birth capacity, even if you somehow manage to double the amount of children per birth.
Also, asymptotically, you'll still be around a 50% split.