Get ready for 'Sometimes A Great Notion', tonally, lowest low the show ever hits, with the absolute highest drama. The final ten episodes are about finding purpose when everything has been taken away from you, and trying to salvage humanity when it's been utterly broken.
It feels like completely condensed viewing right up to 'Daybreak', the finale. I recommend watching the complete cut of that, without the three-part episode break. It's some of the best television ever presented.