Enroll or connect your social enterprise with the local government so that people know it as a authorized body. Meet with the local government officials and explain them about your cause and how it is and will help the society. Show your work done and the future ideas and plans. Once the local government starts supporting your project spread your voice to the entire African continent and subsequently to the entire world. If possible get a website created for your social enterprise so that the world sees it.
If it's for a good cause people across the world will definitely lend their helping hand.