what is next after High Sierra
I have an older 2012 Macbook Air. What is the latest OS I can upgrade to?
MacBook Air 11″, macOS 10.13
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A mid 2012 MacBook Air can be upgraded to Catalina 10.15.7 but no later. See: How to download macOS - Apple Support
The releases, in order, were High Sierra, Mojave, Catalina.
Be aware that if you upgrade to Catalina 10.15 or later you will also need to update any non-Apple 32-bit apps. See: https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html