Has anyone successfully changed speech patterns or their tone of voice?

For background, I am a POC female in business school! I want to appear more professional and respectable to people in the workplace, as well as any potential partners I may have in the future. With a “white valley girl” accent (the ‘oh my god’ ‘girly pop’ ‘slay’) is with no disrespect to black culture, borderline aave and I would like to stop using this borderline aave as I myself am not black! Once again no disrespect to black culture, I am not insinuating people who speak in a certain way don’t deserve respect. I am being interviewed by and coffee chatting professional (majority white) individuals, and I feel as if I am not respected nor heard in these environments with my current vocabulary and speech patterns.

In general, has anyone transformed their vocabulary and speech patterns to sound mature, informed, and “professional”?

I can think of podcasts as a start, and definitely reading more (although it is a bit more time consuming!). The saying “you are the average of the 5 people you surround yourself with” I think is very true as all my friends speak similar to myself. We have picked up each other’s vocabulary, and it has become an echo chamber of “girllll, slay!”, but I can’t seem to flip the switch in corporate environments! As I can’t really get away from my current friends as I do appreciate them very much, I think podcasts would be a great start for me building up more sophisticated and descriptive vocabulary, as well as adjusting my speech patterns to a more mature woman.

Any advice is much appreciated :)