People use the term "writer's block" when they want to complain about not being able to get inspired for a writing project. Actually, it is not specific to writing; a musician, painter, or any other kind of artist can feel blocked.
The energy of inspiration can be felt by the reader if it is present in the paragraph. I don't know how it happens, but it does. I had it when I wrote the first sentence of this paragraph, and if you reread the sentence you can feel it a little. When you have the energy of inspiration, rhythmic sentences spill out of the mind naturally.
"For score and seven years ago..."
"What a marvelous night for a moondance..."
"Absence makes the heart grow fonder..."
Some sentences have that energy. You know when you have them. Write them down. And do not pretend you can force them to come if you feel blocked. Work with your words even though you are blocked, but do not let any uninspired words appear in your final draft.
And never revise inspired words out of your writing project to accommodate a change you are making. The inspired words are the most important.
Another way to infuse a project with inspiration is to make it a collaborative project. Like music played by a band instead of a soloist, collaborative writing compounds the energy it creates. You can send your project to my inspired colleagues at DoctorMyDocument and let us add our own touch of inspiration with the $40 trial.