I just discovered a blog - thank you, Anastasia Suen - that was meant for me : Shrinking Violet Promotions.
This blog is for the introverted writer, and as the quote from Ursula Le Guin says in their sidebar : "Hardly anybody ever writes anything nice about introverts. Extroverts rule. This is rather odd when you realise that about nineteen writers out of twenty are introverts. We are being taught to be ashamed of not being 'outgoing'. But a writer's job is ingoing."
I'm in the process of discovering all the posts, but for anyone who might be interested, they are running a contest with a 1000 dollars grant for a SCBWI member to attend the Los Angeles conference in August. Good luck !