The tool would be a data analytics tool such as google analytics. However, your churn would depend on where the bounce occurs in your funnel, but you have a problem somewhere in your marketing funnel. This can come from a variety of things, from as simple as better copy to less friction in the fu...
Obviously I don't know your situation but you might be running across an issue with expecting one person to do the job of many. There are so many aspects to SEO that its near impossible for one person to be an expert in every area. Content, social media, on-page optimization, user experience opti...