If you previously purchased a retail or volume license for Office 2016, you can still reinstall it:
Microsoft Office 2016 for Mac is or for new purchase by Microsoft. Official support for this version ended on October 13, 2020. Microsoft Office 2016 for Mac Free Download
To Download and Install Office 2016 via On The Hub: * After retrieving your key from On The Hub, select the Start Download button. LSU GROK Knowledge Base How can I download and install Office 2016 on my Mac? If you previously purchased a retail or volume
While you can still download the installer if you already own a license, using it today is generally discouraged due to security risks and lack of updates. Microsoft Office 2016 for Mac Free Download
Office 2016 (Mac): Download and Install Instructions (On The Hub)