LineageOS 19.1 recently dropped, bringing Android 12 support to a whole host of devices, with many more on the way. Whether you have a moral objection to upgrading phones more than once a decade, or you simply can't afford it, with LineageOS you can still have Android's latest and greatest on these older devices.
https://www.notebookcheck.net/LineageOS-19-Google-s-Pixel-2-and-3-other-iconic-old-phones-getting-Android-12.616851.0.html