Don’t expect your best stuff to suddenly appear by magic. You can noodle the germ of an idea into something concrete—you can fiddle and try things and edit and throw stuff up against the wall until somehow the fairy dust of your creative gift is released by the gods and floats down over all.
But before any of that can happen, you need to figure out what you’re trying to say.
For me that usually happens outside my office. Walking up a hill or chopping vegetables or taking a shower. Driving places. Staring out the window.