Folks may be suggesting you add internal monologue or internals to your 3rd person POV.
Here's some deep 3rd person POV.
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Take Quentin, for instance. He had five little towers of copper lined up in a neat row in front of him. He was raking in his sister's pin money, ha'penny by ha'penny, and stacking it up. What was she supposed to make of that? There were men living in round, black, goat-hair tents in the desert she understood better.
He felt her eyes on him and looked up. "You must be bored, watching the play. You should join us."
"Not today. Maybe when I'm feeling better." Maybe when the moon turns green and jumps up and down in the sky like a frog.
"Another time, then. You'll be here a while, if Eunice has her way." He did a top shuffle of the cards, leaving the bottom quarter unchanged. Planting the book, they called that where she came from. He dealt, taking some from the top of the deck, some from the bottom. He wasn't clumsy exactly, but she'd watched experts. Lazarus, for one.
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The first level is the 3rd person POV. The character straightforwardly experiences the world and reports it as seen, heard, etc..
-- He had five little towers of copper lined up in a neat row in front of him.
-- He did a top shuffle of the cards, leaving the bottom quarter unchanged.
-- He dealt, taking some from the top of the deck, some from the bottom.
Then there's the character commenting, inside her head, on what she sees. That's her internals. This is what the character thinks about what she sees and hears and so on.
-- He was raking in his sister's pin money, ha'penny by ha'penny, and stacking it up. What was she supposed to make of that? There were men living in round, black, goat-hair tents in the desert she understood better.
-- Planting the book, they called that where she came from.
-- He wasn't clumsy exactly, but she'd watched experts. Lazarus, for one.
And then there's moments when she actually talks to herself. A kind of internal direct address. That's internal monologue. It appears in the ms as an underline, (or Italics,) and in the book as Italics.
-- "Not today. Maybe when I'm feeling better." Maybe when the moon turns green and jumps up and down in the sky like a frog.