I don’t know what Point of View your story is written in, but here’s something to try if you’re stuck.
I mixed my POV’s up. This is not uncommon at all and many writers do it, but I found it so liberating when writing. It forced me to think about what the other characters are experiencing and it gave me a chance to feel the motives. Here are some guidelines.
1) Process action through the judgment of that character’s eyes. It was easier for me to write a scene thinking about how a character would feel about it (scared, excited, guilty, etc.).
2) Reveal certain unknown motivations through the character’s inner dialogue. I love this so much because it creates an eager want for the reader. The character knows something that no one knows and they’re conflicted about it. The only ones that know are the reader and that character – but no one knows the full extent of it.
3) Conflict conflict conflict! Having the story go from different POV’s really helps to add conflict. This person feels this way against this person. This person is upset what another character did. Fill in your conflict here, but just know I went from a well of conflict to an ocean of it when I started experimenting with POV’s.
Hope this helps! Keep writing and thinking what your characters are thinking!