MacOS 10.14 update not found
I am trying to update my MacBook Air to macOS 10.14 for other downloads that require this software version. I currently have High Sierra 10.13.6. It is a 2017 version, which should be compatible with this update, as I've seen on the web that it's compatible for MacBook Air year 2012 and later. No updates are found in System Preferences, and the only updates in the App Store are for 5 apps but are listed as "Incompatible Updates" (which I'm assuming are incompatible until I reach 10.14 or later).
I've restarted my Mac; I've signed in and out of the Apple store. I've searched in the terminal for new updates, but obtained the response "No new software available." I have 58.1 GB of storage available, which should be plenty enough, as I've seen it takes less than 5 GB of storage.
Please let me know what I can do or if my Mac is actually incompatible with this update - I need this update so that I can use certain software for my thesis.
MacBook Air 13″, macOS 10.13