The single most reliable practical advice I can offer people who want to shake themselves out of aesthetic doldrums is “Change your point of view.” Now obviously that can be construed metaphorically, and while that’s indisputably a good idea it doesn’t quite count as practical advice.
No, I mean it literally: change your point of view. Look up, look down. Climb. Crouch. Lie on your back. Look over your shoulder. Turn you head sideways. Throw your camera in the air (carefully). You can also change your point of view by using an unfamiliar lens (extreme zoom, wide angle, or macro) or a very long shutter speed.
Try photographing at an unfamiliar time of day: you see very different things at high noon than at dawn or at midnight.
When you post-process, look at every shot in black-and-white, even ones you’d normally discard without a second thought. You might be surprised what you’ll see, especially if you are willing to crop.
I’ve taken some nice shots when I literally laid on the ground.
[...] a whim, and mostly just because I felt I ought to eat my own dog-food, advicewise, I looked at in black-and-white. And just like that—*BAM*—I fell in love with this picture. I [...]