I feel like a very old webcomic called 9th Elsewhere would have translated fantastically into the framing story for a solo journaling RPG. The story of the comic itself was about a girl who gets trapped in her own dreamscape and needs a muse (or two) to help her get out. Along the way, there's discussions about psychology, and the surreal nature of the dreamscape, and plenty of other things where you might draw in some random events to give prompt for what to talk about in the trip through your own dreamscape (or the one of a character) and what you encountered along the way. There would be muses, weird things, fears, hopes, dreams, childhood artifacts, and all the rest.
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