Creative workers regularly discuss the ways to get ourselves to work when we feel a total lack of inspiration for something with a looming deadline, as well as ways to create conditions where some kind of creative inspiration is more likely.
There is also the fact that sometimes "inspiration" can lead to a long process, I am finally nearing the end of a multi-year process of grinding away at drawing a comic book that came from the simple idea of "what if I told a story from two sides, with the characters changing designs to ones that scream 'Good Guys' or 'Bad Guys' depending on which side we are currently following".
> I write only when inspiration strikes. Fortunately it strikes every morning at nine o’clock sharp.
That sounds cool.
Game of Thrones was like that. You just got a good hate on, for one of the characters, and they went and spoiled it, by telling their story.
The Boltons were bad news, though. Even the author hated them.
The successful ones have a repeatable process for balancing creativity with the time required to produce a work of art. They tend to have a daily practice of challenging / improving their skills. They setup a dedicated studio, and work at reducing disruptions and so on.