Character development
What would your main character/hero/heroine’s CV look like?
What does he do? Or maybe it doesn’t do? How are they at work? Where did they study, and for what? What skills do they have, and how many languages do they speak? Is she/he realizing the imagined and desired career path, or is she/he still looking for it?
Write your main character’s resume. You may not use everything in your novel from their resume, but you will definitely get a clearer picture of their career path and give it depth.