Growth comes from marketing effort. Usually 6 to 10 hours per week is all you need on your website and inbound marketing to produce an awesome ROI
When you actively exploit the features built into your next generation website you will get an awesome ROI. A next generation website is designed to be a platform on which you can run all your digital marketing activities, including full support for running an inbound marketing strategy or a content marketing strategy.
An annual report by MIT (Massachusetts Institute of Technology) constantly demonstrates the ROI you get from a next generation website. The 2015 report shows that on average a next generation website (along with an inbound marketing strategy) gets 3.15x more visitors per month within one year, 4.77x more leads per month within one year, and 72% of participants saw an increase in revenue within one year.