That may fix the issues that are preventing automatic updating, as that should have been happening all along.
If that doesn't work then be sure to back up all your user data before continuing.
The next thing I'd try, given that you say you don't have settings showing up, is to do a Windows/Cortana search on Settings, which should return the Windows Settings trusted store app (which is what's pre-installed on your machine, or should be unless the installation is corrupt), opening it and using the Reset option in Updates & Security settings, Recovery Pane, and using the "keep my files" option. If that comes back saying it can't reset your PC I'd try it again but using the "wipe and fresh install" option instead.
If both Reset styles fail, then go to the Windows 10 Download Page and trying the Update Now button. If that doesn't work then use the Media Creation Tool from the Win10 Download Page to either download the Win10 ISO then burn it to optical media or have it create a bootable USB drive directly then use your Win10 bootable media to reinstall Windows 10.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story