Keep your own idea file, and review it when you 'just are not feeling it.."
Have a set of things (styles, formats, gifs) that you want to try. Just having options can help.
Naps! I often file in my idea file with a dream idea.
Take a long drive, those ideas always show up when I am not able to act on them.
Things I found out as I wrote "The Muse's Door"