LineageOS supports the Google Pixel 3 with LineageOS 18.1 (aka Android 11). It's definitely worth giving this a shot and you can revert to the standard Google release if you'd like. Word of warning on Verizon devices, though. If you bought from Verizon, they generally place an OEM lock on it. So, the device is "unlocked" in terms of carrier, but locked in terms of OS. Don't buy Pixels from Verizon.
How To: https://wiki.lineageos.org/devices/blueline/install
Download: https://download.lineageos.org/blueline