I am going to be honest. The plot is both unique and enjoyable. So is how the characters are introduced. The world building is also acceptable; it is generic medieval fantasy. But the writing is truly shit. I know you are contracted and want the money, so you do not have time or intention of going back and editing the earlier parts, but just as paying workers properly and providing them with rest increased production and efficiency in your story, editing those earlier parts will multiply your revenue.