When I got my first camera (fairly recently), I started by going out into the woods, walking through marsh, or on the borders of large, beautiful lakes. Know what I realized? I hate that sh*t. I don’t know what the hell I was doing walking through swamps.
I looked at my pictures, and though many of them were fine from a technical standpoint, they did nothing for me. Deleted all the pictures and took a trip to Newark (NJ). Took photographs of people I found interesting. Sold the Nikon shortly thereafter and am now awaiting the arrival of my new rangefinder (M6).
You’ve been in photography much longer than I have. I’m sure you’ve figured out what you like to take pictures of. But it can be more subtle than that. I think people that are often overly critical of their work find that they are adhering to other people’s standards of what good and bad photography is. If you like photographing business cards, and that's art for you, then do that.
Experiment if necessary. Take pictures of things you would not normally take, and see if that catches.