Sorry, I missed the first part of the question because I was lost in translation, but I picked up the very last bit.
Yes, the cost of voting or accessibility of voting is not the most important factor that predicts whether someone is going to vote or not. This is true for both indigenous people and non-indigenous people.
You mentioned the two most important factors. From the latest study that I recently published, it's political interest—which can be linked to trust, although it is quite distinct—and having a sense that voting is a duty, not a choice or a right. Of course, the word “duty” and the perception of voting as a duty is quite normatively loaded. It raises serious questions, especially for indigenous communities.
I would say the two factors are political interest and voting as a duty.