One of the things I struggled with and had to learn how to do was focus on a single user or target market. Many of us start businesses and focus on the entire forest instead of a single tree.
Finding a few people(maybe 10 to 100) who will love and go gaga over what you’re building is better than 1,000 semi interested people. These raving fans will more likely be your evangelists and tells others just like them about your product.
One tip is to look for people who have already exhibited buying behavior with your competitors.
Another tip, if your product is something you use on a daily basis is to target people who are like you. You will do better than other who try to reach everyone else.
Do you know exactly who loves your product?