Sure, contraceptives is a good invention, not new because the condom, have centuries if not thousands of years.
But the real solution is education. the miracle solution to all the problems in the world. Have a bad president?, educate the people and will have better presidents. Hungry? educate people how to use the available resources and will prosper in abundance.
But not the actual educative system, this system dont work, we are talking about a new educative system. The actual educative system is so bad, that the people know that is not a solution.
This is the real solution (tested): https://bienestarmutuo.org/en/ten-principles-of-the-new-education/