You may have attended some public speaking and/or leadership courses or plan to do so, eg:
https://www.edx.org/xseries/inclusive-leadership-training
https://www.edx.org/course/introduction-people-management-iimbx-hr101x
https://www.edx.org/course/career-edge-communication-teamwork-fullbridgex-career2x
https://www.coursera.org/course/lead-ei
or
https://www.edx.org/course/introduction-public-speaking-uwashingtonx-comm220x2
https://www.edx.org/course/career-edge-communication-teamwork-fullbridgex-career2x
https://www.edx.org/course/framing-how-politicians-debate-delftx-frame101x
https://www.coursera.org/learn/public-speaking
However you need practise, practise, practise !
and it is in English !:
So Expats who do not know enough German and
Repats who would like to keep their English are very welcome !