Saw a tweet once that called this "inspiration sickness." Your brain gets so full of other people's polished work that it forgets how to make its own messy first drafts. It's like trying to cook a meal after only looking at pictures of fancy restaurant food. Gotta step away from the screen and just make something bad on purpose, a weird little sketch with no goal. That usually breaks the spell for me.
Yeah, "make something bad on purpose" is the only trick that works. I open a blank file and just start typing the worst sentences I can think of. Gets things moving again.
Oh that's so true. I actually heard it called "creative constipation" once, which is way less pretty but maybe more accurate. It's not just about polished work, it's about consuming anything instead of making. Even reading too many how-to articles can do it.