I’m a massive fan of optimisation tools and Heatmaps are a great way to do this. Hotjar is my personal favourite (Full disclaimer: I previously worked at Hotjar.)
Once installed on your site, you’ll see exactly which features of your site are being used and how they are being used. They also record users screens so you can actually play back exactly what your users are doing.
If you sit through and watch 100 or so site recordings you may start to see common issues your users are running into that you never even imagined.