Possibilities:
Repeat your question.Change the word order in your sentence.Use synonyms.Let friends and family ask the same question to Google Home.In case Google Home still does not understand you, try to use the same command some weeks later. The developers always integrate new functions.Why does Google Home only understand my voice. How can multiple people use Google home?
Activate the multi-user mode in the Settings of Google Home.Or: Change to the guest mode in the settings of your Google Home device.Note that Google Home is linked to an account, so the answers may depend on personalized data.