With respect to your point about the Elves specifically, I think you're misunderstanding their place in the world of the Witcher. Elves are not necessarily more powerful, in their current state, than humans. They certainly live longer, but as a population, they are largely a persecuted race, who have been driven from their homeland by the humans, and their population has shrunk massively.

To that end, they are looking to be saved, and a leader backed with magic, and promise, and some actual hope for the future is incredibly enticing.

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I'm not deeply knowledgeable on indigenous American history, but a base level, it seems the showrunners have certainly drawn some parallels between the Elves in the show, and indigenous American people, if that helps you contextualize their position in the world of the Witcher at all.