How to create a review link for Google My Business Page video tutorial shows 3 different ways to create sharable link to Google My Business Profile.
Recommended way is by creating Google My Business Page Review Form through your GMB profile (press Home menu link) and the review link should look something like this:
https://g.page/r/CHANGETHISWithYourGoogleMyBusinessLink/review
Read more about making a link for customers to write reviews on Google
https://support.google.com/business/answer/7035772?hl=en
You can also use Google Map API Place ID Finder
https://developers.google.com/maps/documentation/javascript/examples/places-placeid-finder
Simply enter and search for business details and copy Place ID
Sample links for you to consider using
To Write a Review
https://search.google.com/local/writereview?placeid=CHANGETHISWithYourPlaceID
To Read a Review
https://search.google.com/local/reviews?placeid=CHANGETHISWithYourPlaceID
Note: Old URL parameters for Google Places ID may not be available after May 2022