Editing.

I hate editing. You're not actually making anything, you're just fixing your screwups (at least, that's what my annoyed brain is telling me at the moment).

But, in the interest of possibly lessening the suffering of another writer out there...

I'm using a spreadsheet tool to help keep track of things (a tab for characters, another for settings, a third for scenes that also holds all the edits I want to make). Something I've added this time is a column for quotes: the best quotes by a character, the best quotes about a character. It's making all sorts of little things go click nicely.