So I’m doing what I do in such situations and what you might consider doing also if and when you are in a similar situation.
Sit down with your outline, synopsis, or whatever you use to lay the story out. Then simply stare at it until you lose your mind or figure out more action/scenes/characters/disasters to include.
This works, not only because it adds words to the story — my current reason — but also because that action provides ideas that improve the story itself. Makes it more complex. Digs deeper into it. Includes twists and turns that make a boring story interesting.
Good luck and I could use a bit of luck right now too!