Reviews
Reviews are one of the clearer, publicly acknowledged local ranking signals, but the relationship between review count, rating, and map pack position is often misunderstood.
A business with a large number of reviews, especially recent ones, tends to signal more real activity and trust than one with a handful of old reviews, even if the older set has a slightly higher average rating.
A realistic rating in the mid to high four star range, backed by a real volume of reviews, often reads as more credible than a suspiciously perfect five star average with very few reviews.