My lifestyle has been unchanged since the outbreak of coronavirus disease (COVID-19).
My lifestyle has been unchanged since the pandemic of coronavirus disease (COVID-19).
"パンデミックになってからも私の生活習慣は変わっていません。
生活習慣 life style, life style habits,
パンデミック pandemic
流行 outbreak
変わらない be unchanged
現在完了形を使って、
My lifestyle has been unchanged since the outbreak of coronavirus disease (COVID-19).
My lifestyle has been unchanged since the pandemic of coronavirus disease (COVID-19).