Right now in Ghana, many view history education up to the secondary level as irrelevant and almost like a token subject about trivial topics e.g. The first person to import cocoa, migratory journeys. Most of pre-WW2 history is based on oral tradition which differs depending on which ethnic group is telling it. Post-war history leading up to independence and after independence isn't covered much due to bias and the sensitive nature of some of the figures who have descendants in prominent positions today e.g. The current president's father was also president in 1972. How should History education in Ghana and African countries like Ghana be covered to make it more relevant?
Don’t give up. History in Ireland is a core subject and considered very important. We learn about our independence movement from its various origins (cultural, violent, non-violent) . We learn about our Rising (militarily unsuccessful) and War of independence (militarily successful). We had a civil war. The divisions are healed now 100 years on. We learn about our early and evolving statehood and attempts at economic independence. Irish history comprises a third at least of the curriculum with other European and World history the rest.
I'm giving my answer as an educator in Canada involved in decolonizing educational curriculum.
There are probably a lot of similarities in indigenous people's histories on Turtle Island (North America) and tribal histories in colonized Africa. Learning about how First Nations, Metis and Inuit (in Canada, I'm not that familiar with US indigenous nations) are dealing with collecting, incorporating, protecting and integrating their histories, governing structures and languages might give you some insight. There's no easy answer, but taking a mainstream approach doesn't solve your problems either. We like uncontested, black and white answers and base most of our history curriculum on it, but that's never the best solution. Decolonializing the fields of history and science are going to be vital for all indigenous peoples around the world, because until that happens, educational curriculum won't be fully contextualized.
The University of Alberta gives a free 12 week course on Canadian indigenous studies that you might be interested to check out.