It's not clear what you mean by "gender balance".
Do you mean having an equal ratio of women to men within the population? or Are you referring to power and wealth being equally distributed between the two genders?
With regard to the first one there isn't much that can be done regarding influencing the gender of child. In response to the second anything beyond providing laws is strictly up to the individual and how determined (they) are. Desire & drive come from within.
Life is a (personal) journey.
Our lives are the end result of the (choices) we've made along the way,
Not everyone has the same goals, same ambitions/desires, or is willing to make the sacrifices required to get ahead.