The worst thing I ever did was sit there staring at the blinking cursor waiting for a 'good' idea. Sometimes you just need to break the mechanism, you know? I'll open a new document, set a five-minute timer, and write the absolute worst, most cliché scene I can imagine. Over-the-top melodrama, cartoon villains, dialogue so cheesy it hurts. It's like clearing your throat. The pressure to be brilliant vanishes, and halfway through describing a vampire who's also a barista for ironic reasons, my brain usually kicks in with something actually usable. The junk draft gets deleted, but the gears are turning again.
Another trick is to steal a structure from somewhere else. Not the plot, but the skeleton. Take the chapter outline from a non-fiction book about mushrooms or shipbuilding, and force your characters into that framework. What does the 'Life Cycle of a Fungus' look like as a romance arc? It sounds silly, but constraints breed weird creativity. The goal isn't to publish that experiment; it's to shock your mind out of its well-worn ruts. The real story often emerges in the margins of the absurd one.