I don’t want to sound insensitive, because people who have suffered from Writer’s Block find it torturous, but I believe it is self-made. I’m not talking about being blocked in a story because a scene has no conflict, or the character motivation is off, or any other craft reason for a story not progressing. I’m talking about when people claim to not be able to finish their story because they are ‘blocked.’
To me, and you may disagree, Writer’s Block is a manifestation of fear, or resistance. You may not know it but it’s likely you’re scared to finish the story, so subconsciously you’re resisting moving forward for many reasons. One could be fear of ridicule, so you never want to finish it so you don’t have to show people. Writing is personal and it hurts when someone doesn’t love it. Another is your sense of purpose. If I finish this story, what’s next? You don’t believe in your ability to come up with something new.
Writer’s block is something you’ve created to stop yourself telling your story. With stories, the more you write, the more you will come up with, and there will always be someone out there ready to tell you what you’ve done is crap. Don’t let that person be you.