For many users still using the Google Home Mini, a recent software update seems to have caused devices to stop working.

How to Reset Other Google Smart Devices Google Home Press and Hold the Microphone Mute Button: On the back of your Google Home device, press and hold the microphone mute button for about 15 seconds.

This article explains how to change the Google Home alarm sound, including the Google Home default alarm tone and how to get Google Home to wake you up with music.