Think in Volume
Once your website has a Google-approved platform for customers to share reviews, you can start working toward earning a GSR. To do so, your website will need to get at least 30 reviews from 30 different customers, all within a 12-month period. On top of that, all 30 of these reviews must have a rating of at least 3.5 stars.
What does this mean? You need to aim for more than 30 reviews. A slew of reviews left after the holiday shopping rush won't count toward your GSR in the new year, and 30 reviews will look less authoritative than a competitor boasting hundreds. Furthermore, potential customers want to see that you are consistently offering quality goods or services. Shoppers looking at 30+ reviews left right after the holidays may say, "What happened to this company? It's July and there is no positive feedback. I wonder if they are still reliable."