Great article!
I addition to your suggestions I have found a certain sense of "trust" to be helpful for getting into the creative zone. Trust in the process and that it will turn out something good, even if at first it looks unpromising.
Making music is such an example: The ego says it''s not going to work (thought bubble, as you put it) and instead of believing it and correcting and correcting the first sounds I crafted, I simply decide to go with what I have in the iron-willed hope that eventually, the muse will come when the sheet is no longer blank.