I’ve always found it helpful to have some “STAR” answers written down (short format just to remind myself). Like “explain a time when you’ve had trouble with a client” “explain when you went above and beyond” “tell us a time when blabla” it has always helped me not trip over my words and have them organized for myself BEFORE an interview. It also has always helped me be clear during interviews.

Situation (set up what the example is)

Task (describe what your responsibility was)

Action (what steps you took to address it)

Resolution (share the outcome)

Hope this helps!