Over the last month or so, I haven't done as much writing on my actual manuscript as I would have liked thanks to assignment marking deadlines, but I have been making some significant changes to the novel outline. One issue I had originally was that there were parts of the outline where I didn't really have a good idea of what I wanted to happen. As a result, these sections were either rushed and lacked adequate detail, or had 'placeholder' events that were there just to get the story from point A to point B regardless of whether those events made sense. In a similar vein - as I've complained about before - there were multiple instances of thing happening Because The Author Needs Them To rather than because they were logical things the characters would do.
After a lot of staring vacantly at my computer screen and a lot of scribbling on post-it notes, I moved some things around and had to add another chapter to try to fix those problems, only to discover that something else that was important doesn't really fit anymore. It was a bit like playing Jenga, with the whole thing constantly threatening to come crashing down around my ears, but eventually I managed to remove most of those rushed or illogical events from the story. For the events I previously didn't really have a logical explanation for or the explanation was ridiculous (for example, the event happening being technically possible but the level of chance/luck required for it to happen was astronomical), I was able to reconsider some of the characters' motivations and behaviour and how other characters would respond to that, which meant I could then say "Here is why Character A might do X, which means that now Y happening has gone from statistically implausible to reasonably likely".
There are still a few remaining elements where I haven't come up with a good explanation for them yet. Mostly surrounding the backstory of the antagonist, a powerful supernatural being who is both a ruler of her realm and a prisoner of it. The reader and/or the main characters may not ever learn the full reasons behind why something is happening in the story, and that's okay, but as the author, *I* still need to know why it's happening, so that I can make the bits the readers and characters do learn at least sound plausible.
All of this restructuring has resulted in some bits I previously liked being significantly reduced or cut out entirely, but other sections have been expanded, and I think the story overall is stronger for it. I certainly think it flows much better than it did previously. The manuscript is over 30,000 words now, and my estimate from eyeballing the word counts for the existing chapters is that the final product will end up at around 75,000 words, so it's looking less like a novella and more like an actual novel.