It doesn't matter what service you do if you dont advertise right and keep at it, you will fail whatever service you take on.
Im a window cleaner, and i have plenty of work because im specialised in one trade and push the advertising with repeat one off work (1 or 2 times a year stuff) or regular work, glass restoration, CCU's etc.
If i wanted i could add gardening or CC on to my services, but i dont see the need. I dont want to either.
Basically if you dont promote and advertise your services well, look the part and charge cheap silly prices you will never get enough work - people will just look at you from a height, and wont be willing to pay more money!
Charge well, do a great job, and look the part. Advertise well and increase the prices.