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Fake it till you make it.
Do finger exercises. Pseudo-haiku are good practice for concise imagery and lean, spare lines.
Write a scene that absolutely won’t be used anywhere else. Just a scene for its own sake.
Start an interaction with two characters you know nothing about. Let them reveal themselves to you. Let yourself be surprised.
Write crap, particularly when you know it’s crap. Break the myth of writer’s block, where you tell yourself that you can only write when the stars are aligned, or some such nonsense.
Write because you’re a writer, and that’s what writers do, and drop the excuses.