Experts get questioned about their expertise when the people they are interacting with do not feel like they are cared for, listened to, validated, or respected. The best way to share your expertise is to help others feel like you actually care about them. (Medical, Business, Relationships, it is all the same…)
Self-centered experts are hard to trust. No one likes a “guru”. But everyone wants to follow and be guided by a true expert or guru, they just do not want to feel like they are being told, spoken down to, or manipulated.
To get your expertise trusted, show them you care more for them than you do about your ego.