does comp actually help you improve

im more a less a qp warrior bc ive been playing qp to practice my widowmaker aim, and anytime i do give ranked a try i place in silver/gold and it discourages me from playing more. i go back to qp to keep improving my aim, but lately ive been feeling stuck like no matter how much i practice i still perform generally average. any advice? or do i just need to get over my fear of comp to improve my widow further