Learning how yourself is a skill worth having. Seeing yourself as a marketer of cleaning service and not a carpet cleaner changes your mind set and how you approach your business.
take tiny steps testing stuff. One area is search within your town and search outside. as a example people in your town will search carpet cleaner or carpet cleaning having these for people outside would blow you budget in no time.
use insights within adwords as this tells you how you show compared with your competitors. things like if your above or below , etc, etc
https://support.google.com/adwords/answer/2579754?hl=en-GBWhat your goal is with adwords is not how much each customer costs (not how much clicks are) but can you provide a service for this cost plus your overheads. which is hard to do when everyone uses the internet to price shop.