1. Get more people to your site.
Obviously if no one sees your site, your not getting noticed, your not getting leads, and you can't get potential sales...
So if you have a website, you'll need to advertise it first to get your potential sales.
2. Raise the average ticket sale.
Ok, so you have people at your site and the leads are converting at price 'X'.
In order to raise your ticket sale you can raise the price of your product, have more products to sell, convert the leads at a higher ratio, sell more back end products to existing customers, etc...
Why is business so complicated and why can't people make money, if there are only 2 ways to increase your revenue?
Where do people get stuck?
Finding a niche/ target market? Creating a product? Finding affiliate products? Having a converting website? Up selling or cross selling your customers?
What do people have the most trouble with?
What do you think you can improve to double your income?