There’s a distinct advantage to having long or severe winters. Your boredom is stoked and you have the time to create while you wait for less inclement weather. Genial weather.
Because when shorts and sandals time comes, there’s lots to distract, places to be, things to thing.
The only thing that’s consistently helped me—having grown up in the deserts and asphalt of Arizona and Southern California—is implementing a habit as daily discipline.
The periodic creativity romanticized by a private holing up and creating a masterpiece tropes has long been exemplified for me by Edward Gorey’s The Unstrung Harp. I recommend all writers and artists in general find that piece. It’s one of the most penetrating, incisive looks at creative process, eschewing hand-waving techniques like montage. It’s visceral and arresting, and creators will recognize themselves throughout.