What’s the best way to get rid of intense shyness caused by trauma?

Even before COVID this been an ongoing thing. As a child I used to be very outgoing and sociable, however I got bullied a lot for being too loud and obnoxious. Since then I started dumbing down everything I do. I stopped talking a lot and became the “shy person.” Now this has became a permanent response to everything I do. Why has this happened? What’s the best way to get rid of this?
What’s the best way to get rid of intense shyness caused by trauma?
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