Why does Africa have borders? The United States of America has been successful over the years because of its consideration of itself as a continent encompassing the States instead of a continent encompassing different countries.
There is strength in numbers and it shows in the ability of the USA in succeeding in its economy for so many years.
So, this is a model that works, and from which Africs could take lessons for replication. There is no need to merge the continent into one country, of course. However, what can be done is to eliminate borders.
The elimination of borders would benefit the continent in reducing taxes, trade regulation while widening the expansion of the economy.