Hello
These professions are not widely known in Greece, so even if I give you the perfect translation, very few may understand what you do anyway.
You may try these :
Professional Inspirational Speaker -> Επαγγελματίας ομιλητής που εμπνέει/παρακινεί
Executive coach -> Σύμβουλος ανωτέρων στελεχών
They will probably ask you to describe what you do.
---------------------------------------------------------------------------------------------------------------------------
Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.