Are you experiencing missing reviews on your Google Business Profile?
If so, please use the regular ‘missing reviews’ support link from Google’s Help form:
https://support.google.com/business/gethelp
It starts with “Tell us what we can help with *”
enter “missing reviews” and then proceed by selecting the ‘missing review’ chip.
Go through the form and complete the submission.
Google’s team will help to reinstate the reviews.
An additional note:
If you don’t get all your reviews back after getting Google support’s assistance, there is a HIGH likelihood that your reviews don’t pass their quality guidelines.