[request] [help] How can I secure this comforter better Sewing Machines Parts and Sales in Los Angeles

Hi Threddit 🙂 Im new here and just wondering how I can make these fabric pinches more secure on this comforter Im buying. Im not great at hand sewing but hoping someone can tell me what basic sewing technique I can use in these “pinch points” on the comforter to help secure them and hold the batting/filling in place. Thanks 🙂