It is difficult to say how many reviews it takes to go up a point on Google. The answer may depend on the competition for your keywords, your website's age and authority, and other factors.
That being said, getting more reviews is generally a good way to improve your website's ranking. Google uses reviews as one of the many signals they consider when determining where to rank a website.
There are a few things you can do to encourage more reviews:
By following these tips, you can increase the number of reviews you get, which may help improve your ranking on Google.