No need of 5 more Nat am civs. Simply because they were not at all maor civilizations back then.
Iroquios was never a major civilization in terms of
Population (only 12,000!), Net GDP,(not even on the scale) Political system(mainly tribal), Technology level, Army size, Navy Size, Agrarian output, and Population distribution
So I would replace Iroquois with Bengalis the or any other Indian civilization each numbered more than 10 million people, existed from Before Christ, who are by far the most populous of all the Indian civs, and whose armies were in the millions.
Bengalis(Palas) were 40 million strong with 10% of world GDP alone (similar to Dravidians)
3 more Africans and 2 more Indians is all we need. Although even that will not be enough to cover the vast richness of African old world and Indian old world
Palas, Dravidians (more general term than Tamils), Oriya, Swahili, Kongolese, Zimbabweans at the very least should be added