Kang the Conqueror is not going to be used by the MCU anymore, even though he had been set up to be the main villain of the next two Avengers movies. Albeit for very different reasons, Marvel has also quietly moved on from characters before, and I think some of them could do with an MCU return. Eternals was a movie that did not live up to expectations, but I think Dane Whitman is a character Marvel should bring back. Wasting a talent like Game of Thrones star Kit Harington makes no sense, and he could the Midnight Suns.
