They are working on a review overhaul but the executives at epic want them to make cross store compatible with EGS and Fortnite so it needs to be made more robust and modular than if it was just for fab, this means it will likely be done last.
That being said some of my best sellers don’t have any ratings visible, the majority of people buy products based on value proposition not popularity, some buy solely on popularity but those are a minority. Fab search is more keyword focused compared to the marketplace, so it’s possible your title is either too generic like “bag” or it’s too branded like “ultimate bag integration system”, you gotta experiment a little and find a balance of what is searched most relative to your title but also not littered with competition that is better or cheaper than yours.
Additionally if you sell well on sales that means your base price is too high, this is fine if you plan to do discounts all the time but otherwise it will hurt sales.