SU seemed pretty boring to me.
But when I get to look some of the Future synopsis, that was pretty deep. Getting to overcome PTSD surfacing after convincing everyone you should not fight or commit genocide. It's not normal for a series to be that realistic.
Of course, people will tell Steven didn't succeeded in shit, and they're right. But you don't really overcome that stuff, and he's pretty young.
Honestly you could continue the story.