The following elements are needed for a prosperous society:
1) Free Markets
2) Rule of Law
3) Honest courts and police to enforce contracts and put evil people in jail.
4)Secure boarders so that their country is not overwhelmed by refugees or foreign armies.
If these qualities exist citizens can accumulate and create wealth. Only Africans can to this for themselves. It requires good will among the people and this depends on the personal character, morals, and values of each individual.
Don't leave out the right to private property without confiscation.