Ditch your laundry list of topics you want to write about. Ignore all the outlines you started months, nay, years ago. They’ll be useful later. Maybe.
My biggest writing secret is getting down what I have on my mind the moment the idea strikes. Usually it’s in the morning when the internet is quiet and my mind has time to wander in the shower. Don’t worry about an introduction, conclusion, the flow, grammar, any of it yet. Just get your raw message down. Edit later.