If you want to increase your sales conversion rate there are several things you can focus on depending on the product or service you are trying to sell. In general, you want to target customers who are likely to purchase your product or service. It is a waste of resources to advertise or engage people who are not likely customers.
You should focus on honing in on your customer base. Conduct surveys or focus groups to find out who will buy your product and what kinds of things they are looking for. Then you can tailor your marketing efforts at people who want to buy what you are selling.