I suffered from writer's block and its nasty partner in crime, Imposter Syndrome. Early on in my novel (my first, so I didn't know what the hell I was doing) my mind was a blank slate. Everything I put on paper sucked. I didn't know where to go. I couldn't push the story forward. I didn't know where it was going.
Then I had an idea. I had been struggling writing in third person, so I rewrote the scene in first person through my protagonist's eyes. And I realized what the problem was. I was trying to tell the story from a distance. My writing style changed and to this day, that little experiment helped push me through the story. I'm still writing third...but standing over the shoulders of my characters.