Borrow a voice to speak to you as the voice in your head, one that will narrate your thoughts back to you. The voice should be both glamorous and trustworthy, maybe a movietone voice, or a poet from another land, or a broadcaster from another century. A voice you can trust and enjoy.
In this voice, speak to yourself about whatever you’ve been chewing on or nurturing as an image to be written or area to be explored—the thing on the near horizon that you’ve been wanting to write. (This might be something new, or it might be an intuition about another layer or further unfolding in whatever you’re currently writing.) Take advantage of what your borrowed voice offers—stylish bluntness? seductive lyricism? melancholic goodness? Let the voice diagnose and clarify your intentions and tell you something about what you need to do to be able to keep going.
The point of using the voice is not only the pleasure of ventriloquism but the slightly askew angle of approach to the territory of your own mind. If borrowing a voice is uninteresting or too weird, try speaking to yourself as yourself, but as if from this place askew to your habitual centerline.