crying.
Or rather, imagining a bit farther down the line.
So each night before I go to bed, or on long carrides (my commute to work is 1hr one way) I usually imagine the next scene and the one after that for my writing project. ie: will just hit his head and is now bleeding. well crap who responds, who calls the doc, who tries to bandage him and do they move him, is he unconcious? And I figure out that bit.
It's what keeps the story perpetually fresh for me. When I get thinking that it isn't good enough I let myself be sad and cry and just accept those emotions. I personally believe it's important to accept that sometimes you feel like your stuff is crap, and sometimes you put out crap, but it won't always be like that. Writing is harder to show it, but drawing does easily.
What I do when the "daily" scene by scene stuff doesn't work (and I mean I can mull over the same scene for like 4 days or 4 weeks depending on my writing mood). I change up the avenue and allow myself weird thoughts. And then I record it somehow. Either as a sentence for later ideas, or as a more formulated idea, or as a short.

I personally love the idea of 663 jellyfish children for Will and Crow. It's the most random thing in
their world to happen. And that's saying something considering they have magic and parallel worlds and all that.
And if it's a short, sometimes it's REALLY short and sometimes it's a few pages. And sometimes it's not going to be something that will end up taking place. ie Crow and Will have a convo about will finding all these shampoo bottles in Crow's shower cause they're cleaning out his shower once. that scene must've been written in like 2013 and it
still hasn't been put to use.