on Jane Friedman site:

Much of the available advice for conveying inner life in story involves allowing readers more deeply and intimately into what’s going on inside your characters: Eliminate “filter words” like thought or decided or saw; immerse the reader in the character’s perspective; express the character’s thoughts in their voice.

That’s helpful when you’re writing in one of the direct POVs: first-person, deep third, or even the relatively uncommon second person. But what if you’re not?

When using indirect POVs—limited third and omniscient (also objective, though it’s rarely used in modern fiction)—the challenge is often exploring interiority while not breaking the boundaries of these narrative perspectives.

Knowing how to effectively give readers insight into your characters requires being aware of these differences and how to adapt the techniques for conveying inner life no matter your story’s POV.