upgrade my 2015 MacBook pro
I am trying to upgrade my 2015 MacBook pro that is currently running macOS Sierra 10.12.6 I have gone to the app store and it says no upgrades available. When going online I have tried to upgrade to 10.13 and 10.14 but when I try to do this it says "this update requires 10.13" which is what I'm trying to do!!! HELP I need this for work and I keep going in circles