... I've worked on macro, sports, portraiture, real estate, architecture, and wildlife but right now none of those seem appealing.
My suggestion is to stop 'working' on it. Your expectations may be too high, which at the moment is blocking your creativity. I would suggest to slap on a prime (simplify!!), relax and go out and play. When you lower your expectations, there's less pressure to 'perform' and that will allow you to free your creativity.