@Sonja301 What do you know about your target market? That is, who is interested in staying in Allen? Students, tourists, business people? You may have gotten a boost in the search for a period of time when you started, but now you have to have activity on your listing to keep a higher location in the search.
In addition to understanding who seeks to stay with you, you might also become aware of any seasonal factors that affect visitors to the area. Having this information might help you strategize about tweaking your listing description and pictures along with using other social media.
Your listing appears very nice and you have positive reviews so you are off to a good start. Good luck!