Maybe consider tweaking the trailer tone. I didn't play for a long time specifically because of the existing trailers, now it's one of my all time favourite games. The current tailers make the game out to be hard, punishing. But it's not, it's just detailed. If you respect it's world it's not hard. For example I've never frozen or starved to death, but the trailers make it seem like that's a typical part of the experience. Focus more on the detail and less on the dying. Some of it is just what you lead with. Consider this trailer the first 30 seconds set a tone and that tone is "this is a game about dying a lot", is that what your game is actually about?
edit: even the thumbnail conveys "difficult unpleasant time"