Why not create a blockchain project that focuses on teaching or educating Africans to earn for themselves(for example an online schoool using blockchain as it's backend)?
They hardly get a reliable internet connection in Africa.
That's just an example and if OP here is really serious about developing a new blockchain product to solve an African problem, he, together with his few partners can find a way for Africans to access their product with ease. They also might be able to gain more supporters that can help them achieve what they want to do even if the internet is intermittent there.