1. Remember what everyone says: "The money is in the list"
Do not expect to earn only by the products that your visitors purchase. Add optin forms somewhere above the fold, check how they look both in your desktop and mobile, and retarget them through your email list. Don't have money to set up your list? Mailchimp is offering some great free plan.
2. A/B test everything
Find a good testing tool, and test everything --from the color of your buttons, to your pricing, your landing pages, everything! If you are looking for the best FREE a/b testing tool, start from Google Optimize.
3. Don't over-optimize
This is a huge mistake many people do. Don't forget that your visitors are real people who visit a website. If your site is filled with optin forms, ads and/or products, all you will achieve is to send them away from the first page they visit.
4. Don't lose time for SEO
Forget SEO, forget free traffic, forget anything that you need to spend time to set up. Choose a subject that you like, create a Blog, start writing articles --keep them over 1,000 articles, add an SEO plugin and optimize your articles according to its instructions-- target some long-tail keywords and don't lose any time for any other SEO task. I always present SEO to my students as a real "mind and time-killer". Instead, spend time on your professional development, spend time for plugins and themes that can help you improve your conversions, increase your knowledge. Looking for a good, SEO plugin? Start with Yoast!
5. Pay attention on the following...
i. Loading time: Check your site with Gtmetrix and make it load in less than 3 seconds, or you will be losing traffic. Tons of Traffic!
ii. Your landing pages: Choose a theme with built-in landing pages or other templates. Use them to add your new products. In most cases, these built-in templates will save you more time. Instead of spending money in any other task, spend them to get a good, reliable, quick loading theme.
Hmmm... if there is anything else that you are doing to increase conversions, go ahead and add it below. I'll be more than glad to read it.