I’m building a site for work, and we’re coming with ideas to improve the user’s experience on mobile. The idea came up to build one of those headers that appears when you start to scroll up. I like these, because it frees up part of your already-limited viewing space from having a nav stuck to the top of the screen, but it also means you don’t have to go all the way back to the top of the page if you want to access the site nav.