Google has quality guidelines available online. However, you may note that there are numerous recommendations for negative signs but few for reasonable indications. Consider for a moment what happens when two, 10, or a hundred websites aren't doing anything wrong. How can you tell if there is a quality difference if no one does anything wrong?
There are some suggestions for making your site more helpful, trustworthy, and engaging. Still, when it comes to being more valuable or high-quality, Google advises, "be more useful or elevated."