If you're finding that the Google Assistant is either struggling to hear you, or is over zealous and is picking up wake words too often, then you might want
Google Assistant update brings better voice training and sensitivity toggle
How to Adjust the Audio Sensitivity of Your Google Home Device
Google Assistant is too sensitive, can I adjust it? : r/GooglePixel
➤Google Home: you can finally adjust the sensitivity of OK, Google 🕹
Assistant soon gaining 'Hey Google' hotword sensitivity setting - 9to5Google : r/googlehome
Hey Google do you hear me? New features for Google Assistant - Gearbrain
Is Google Listening to You? Yes, and Here's How to Stop It
Google Assistant: Adjust the Hey Google sensitivity on a home device
How to adjust 'Hey Google' sensitivity
Adjust the Home button settings on your phone
Is Google Listening to You? Yes, and Here's How to Stop It