I wouldn’t call it writer’s block as much as indecisiveness. If you haven’t been able to move forward in a year because of too many “what if’s”, just pick one and work it. Seriously. Unless a particular route is totally illogical based on what you’ve already got written, just put the car in gear and go. You might run into a lot of potholes – or you may find smooth sailing (to mix metaphors unashamedly) – but that’s the only way you’ll finish the story.