Unable to upgrade m1 MacBook air from Sonoma 14.5 to Sequoia 15.1, any suggestions?

You may be able to resolve it short of this … but this may require you to seek assistance from an Apple Store or Apple Authorized Service Provider to "revive" or "restore" the Mac, with the aid of another Mac running Apple Configurator. (If you do, be sure to back up your Mac before taking it in.)

TidBits – Solving the macOS Installer’s “Failed to Personalize” Error with New Firmware

What happens when you try to upgrade? How much free space is available on your internal storage?