Ever wondered why you are just not selling those products, after all your effort to drive traffic to your site. Here are a few quick tips to make the sales process more engaging for your visitors.

1. Establish a Call-to-Action at the Bottom of Each Page or Blog Post

Look at:

How many of visitors from a referring URL are actually exposed to a "Buy" Call-to-Action (CTA).
How many actually click to the sites first page [home] where the CTA is more visible.

As this is the first page in the conversion funnel, it is imperative that visitors be driven from any page on the site to this page as part of the CTA

Add the CTA for the book directly below each blog post, actually building on the blog post to try to directly sell the book then and there.

2. Provide Multiple CTA Options

Track the conversion funnel exit points
Test if the sell is too hard - make the offer softer by offering a free whitepaper or ebook [compiled from part of full book] of the final product, then use this to drive sales to the main product.
Capture the users name and email address, and use a follow up sequence over 7-14 days

3. More Compelling CTAs

Make the free offer compelling in subject and title.

4. Provide Multiple CTA Opportunities

Place a small banner or link CTA in the top right hand corner of the website.

5. Optimize the Purchase Process

Add more information (sales letter, list of chapters, testimonials, add risk reducers etc.) to the product landing page.
Keep the sales process restricted to only a few steps.
Make purchase buttons very visible

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