One way to add excitement to your story is by adding lots of bad-guys, also known as EXTERNAL Conflict. Another way is by adding INTERNAL Conflict, more commonly known as Angst.
I'm sure most of you have noticed by now that most movie characters, and far too many book characters, are One-Dimensional. They do stuff, but they don't face any personality issues: a hang-up, a fear, paranoia, a moral code, a love interest, a strong dislike Or worse, they do have all these things, but they never really affect the story.
There's a Plot Arc, things happen, but no Character Arc. The things that happen don't affect the characters emotionally.
Where's the ANGST?
Answer these two questions:
1. What is your character's biggest character flaw?
(Think: 7 Deadly Sins.)