Firstly, we will ensure that children are fed the proper amount of nutrition to develop properly. Small PENIS size has a heavy relationship with childhood nutrition, and stunted growth decreases it.
Secondly, we will ensure that women have the proper hormonal balance during pregnancy. The wrong hormonal balance in the womb also stunts PENIS growth.
Third, we will ensure that people have the privacy and sexual education necessary to fap regularly. Use it or lose it. Also they will be educated not to constrict too much so it doesn't become skinny from squeezing.