How do I decide what to write about?

Before I answer that question, I want to look at something closely related, but something I have only seen addressed one single time. And that is: how to be in a conversation where you listen in such a way, that everything you say will be delightful for to the other… where you are in a gentle and pleasant dance… instead of how you are now: separate, all about yourself… never dancing, never really having an experience of…