You have an outline of some sort. Whatever works for you. And you’re following it as faithfully as your characters will let you. You know where you came from and where you’re going.
But no journey is without side trips, problems, unexpected stops and whatever else must be dealt with because things happen. The oops moment. Or the eureka moment that’s so wonderful you can’t leave it out and can’t imagine why you didn’t include it in your story to begin with.
Problem is, when you’ve dealt with whatever needed dealing with and you’re ready to get back to your story as it was plotted, you find you’re lost. Completely, totally lost. You still know where you want to go but you’re no longer are sure how to get there because whatever happened that was so wonderful, changed your original itinerary. What to do?
Novels don’t have maps or Garmins but there is a neat trick to use in such situations. Stop writing and think of what wouldn’t happen next to your characters. What absolutely would not happen.
You might not use any of the ideas that pop into your head but you’ll get the creative side of your brain working once again and the exercise itself will uncover enough new story lines and ideas that you’ll figure out a way to get back on track.
There’s a potential added benefit to this working writer tip. Your new path might improve your story in ways that would never have happened if you’d not spent time in places your characters would never, ever go on their own doing things they’d never do in a million years.