One of the things about being an "expert" on anything is that people unconsciously assume that you've always been an expert. Non-experts didn't see the years of work you put into becoming an authority on the subject. They didn't see the times you failed. And flailed. Or when you picked yourself up and tried to learn from your mistakes. 

Anyone who has done even casual research into building an audience has encountered the idea that, in order to cultivate fans, you have to, you know—talk to them. Give them a piece of yourself. Entertain them. Make them think. Keep them engaged lest they forget about you.