Upgrade to Mojave?
Is Mojave still available? Do not see it in the App store. Currently running Sierra 10.12.6.
iMac with Retina 5K display, macOS 10.12
Question marked as
Best reply
The model and year of your Mac will determine which macOS you can upgrade to,
read the following links.
How to upgrade to macOS Mojave - Apple Support
How to upgrade to macOS High Sierra - Apple Support
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.