Just one new native would be the absolute minimum.
Muisca would be reasonable for the Andes maps, Orinocco, and Amazon. They’d probably need another map in the Colombian region such as Chocó to justify them.
Maroons could also act as a replacement for the Mesoamericans in South America and could be used much more widely than that.
Ideally, I’d like to see both of those as well as Jivaro in the northern parts of South America. In the south of the continent, they could also use another native to replace Mapuche if they ever get elevated to full civ status. Maybe Charrúa could be that replacement.