Email Newsletter Ask- The more times and ways you ask for reviews the better! If you already do a monthly or quarterly newsletter add a section about reviews! You can highlight an individual review or an individual employee in this section and you can ask again for people to go to your review page and write a review! Very little additional work for you, and it can bring in a lot of reviews!
Below is an example of a newsletter review section so you can get an idea of what we are talking about. (It is on the bottom left section.) Thanks!