Do not wait for the muse to knock on your window when you sit at the table with a notebook in front of you.
Those moments are rare, if they happen at all.
You need to invite the muse by writing every day, wherever you are, on the train, in a meeting, at the restaurant.
The writing can be a snippet of a conversation you have overheard or a sentence, or word, that came to mind while watching the trees flit by.