One thing you could try is putting away all your gear (don't sell them now), getting a couple of film holders if you don't have them, a large format pinhole camera (or making one yourself during an evening) and start photographing exclusively with it. Developing sheet film in trays and contact printing them under a light bulb, the experience just doesn't get any better. I'd choose at least 5x7, but 4x5 contacts can be very nice, too.
And the camera will be as simple as it can be, but still remain a powerful tool. This could be refreshing coming from the Nikon F5. Or anything else, for that matter.
Don't forget a light tripod.