Kicked the chapter I was working on repeatedly, in ways which involved taking about 500 words out and then putting about 1200 new words in, and then got 2000 words into the next one, which was much smoother sailing.
This is the first major turning point, just short of a third of the way in, which is meant to be an abrupt and surprising shift from "this is the major and serious threat we are dealing with" to "this problem has been basically solved, all that's left is tidying up loose ends", and my protagonist coping with the perspective change, and adjusting to her duty lining up with what she actually wants to do in terms of exploring the much bigger and more interesting thing that showed up while engaging with that immediate threat, rather than requiring her to deal with the immediate threat.
I worry most about the pacing, and I am not going to be able to tell, there, until I have the whole thing written. The point of the book up to now is to deal with the immediate threat while laying groundwork for the larger-scale issue and introducing a bunch of characters and their interactions for the remainder of the story. Chapter and a half or so more prep, a chapter or two of stuff happening on the journey, and then we're two thousand lightyears from home and can get to the really fun stuff.
