Unsubscribing (Nadège)

Hi dear coach,
A member unsubscribed from my mail list today. I was amazed how fast YOUR thought, from the How to be a coach podcast, popped into my head: “Good, we don’t want any people who is not riveted to what I’m saying on my email list!”.
But at the back of my mind, I could also hear my own little voice: “see, finally someone’s smart enough to find out you don’t know what you’re talking about!” I know it’s just a thought, but of course the consequence is that I get to believe that I don’t know what I’m talking about.
So I’m reading about the impostor’s syndrome and discovering, surprise surprise, that I may be afraid of succeeding! Agreed, 100% I seem to have all the signs and symptoms from the Wikipedia page:
I suppose I just need to work on it, one thought at a time. Any particular advice?
Thank you so much and have a great day!