There will inevitably be days when the creativity escapes us. The thing we have loved and cultivated for years will be all but inaccessible.
The best course of action when those days come, is to do it anyway. Work through the blockage. Even if we consider the end product to be less than desirable.
The important thing is building a new neurological response to creative block. Eventually the mind will learn to treat these obstructions as hurdles rather than barriers.
Even if you have to downshift, moving forward at a slower pace is still a victory.