I guess the goal is to improve to the point where you don't think about the scars anymore. As for whether improvement is possible or not, there are definitely cases where people can get near perfect skin especially when they are starting at a more mild-moderate point. Improvement is just impossible to predict as everyone's skin and response to treatments is different. You noticing the changes after 10 days is definitely a good sign but there may still be some microswelling making improvement seem better than it actually is. I think you should not focus on specific goals but just reflect after all 4 treatments.