This is why I detest genAI. Creativity isn't having "a cool idea, but not knowing how to write". Creativity is the little decisions at each paragraph/line for what you intentionally include or omit.
Good ideas are free and abundant. They're not special.
Refining them into a 'piece' is special.
Huw Swanborough
People who don't write books assume writer's block is staring at a blank page with zero ideas. In truth it's invariably the opposite. Writer's block is when a dazzling array of options become tyrannical, team up with an unwillingness to fail, mug you in a dark alley and stick a bag over your head.