You have to know what you do best and use that in your marketing plans. If its floors, say so. Me, I LOVE cats and mention this in all of my online profiles. Cat owners tend to want to hire other "Cat People" because they know we wont be upset by kitty fur, kitty litter and other cat related messes. I have become quite proficient in removing pet fur from furniture, to give you an example. I also offer Cat Sitting when the owners goes on vacation!
Floors and bathrooms are the areas I excel at. I dont know why but I just love cleaning floors. Go figure. I use Shark vacuums with super bright headlights, and those lights show me SO much more.
Bathrooms are always extremely dusty and usually full of hairs. Paper products and towels produce the dust, and we humans shed a lot! I have become truly good at getting that stuff up quickly, and for some weird reason, I enjoy doing this. Go figure.