My site used to average 1.7 pages per visitor and it is now roughly 1.3. I attribute this directly to increase in mobile use. Mobile share for my site is now approximately 65% compared to under 30% earlier. Mobile design (using a responsive theme) has caused the site to be less navigation-friendly than it is on desktop. I have tried to make the mobile design as friendly as possible by adding some customised elements, but still, on a desktop everything is just in front of you i.e. you can see the different parts of the site without needing to move around.
One way I might be able to get around this problem is adding a sticky mobile footer and linking to a few of the most important articles/sections on the site. But I am not sure if a sticky footer is user friendly. Will a sticky footer with several lines of content put people off? Would it make the content page they are on less user-friendly e.g. difficult to scroll? Since majority of my visitors are from search engines, I still want the page they've landed on to be the primary focus. I don't want to add something if it will become too distracting and causes them to leave the site, instead of the goal of actually increasing page views.