I have only two writing moods:
1. There’s 2k words down; I can fit another thousand before dinner!
2. I have 300 words left before I hit my minimum count goal and I would rather physically bury myself into the ground and die a dreadful suffocating death than write another sentence.
Like any skill, that ability takes a while to work towards, and some days it will always be hard to write, but the longer you do it and the more you’re able to let go of your inner editor, the better writing days you’ll have.