What if Frodo hadn’t taken the one ring to Mordor and instead he’d used it for his own gain? What if Tess of the D’Urbevilles had never written that letter to Angel Clare? Would they have lived happily ever after or would the past have come back to haunt her anyway? Life is full of crossroads. We make decisions that take us one way, without ever knowing what would have happened if we’d taken a different path. Storytellers use these crossroads to their full advantage. They use a characters flaws to ensure they have to take the hard path. That’s what makes a story interesting.
Your writing prompt: Take a character (yours or another author’s) who made a decision that sent them down a certain path. Now let them make the opposite decision and see what happens.