What do you do when you have writer's block? You write anyway. Don't think too much about what you want to say, but say what your mind is saying. The words will follow naturally, just listen to them and write them down. Don't erase them (yet). You just need to get the first draft, and then rewrite it (over and over). A spark will hit you, which will lead to another, and another, and before you know it, you'll have a thunderstorm of ideas.
What do you do when you really can't think of anything to write? You write something that's already been written - just write, then change it up a little. If it works for music, why not words?
Coders do this all the time - finding a piece of code that is near to what they want, and modifying it 'til it suits their purposes.
Write something, anything. Come back later and change it. But I can tell you now, writing nothing is much further from writing what you want to write than writing something you don't want to write.
Synthetic Muso-Regurgative Composition