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Not sure if this helps, but….
One of my characters (who I’ll just call Loki) is very quiet, he’s not super shy but he doesn’t like to speak unless it’s necessary. One of the ways I help myself to portray this better is to dig deeper. Why is Loki so quiet? Was he always this way?
In Loki’s case, he’s a ex-villain now working with the heroes. He’ll never admit it, but he hasn’t forgiven himself for the things he’s done in this past, and as such he considers himself out of place and an outcast even though the heroes and others have forgiven him and accepted him. He stays in the background, bottling his opinion and thoughts because he’s also scared of himself. He’s scared he’ll scare someone else and lose his place in the Heroes’ group of friends, and he worries that they haven’t really forgiven him.
Loki is an overall softer character now that he’s given up his life as a villain. He wears sweaters and cozy socks, prefers to stay inside, and speaks quietly. He’s also interested in getting a small furry pet to take care of.
Keep in mind that Loki is rather on the extreme side of the quiet-and-reserved spectrum, and remember why your character is the way they are.

Giving a character’s behavior a root gives it a purpose.

Hope this helps 😉