im just making a guess because though i havnt seen you play, you are plat.
be intentional when you play. you shouldnt ever just be standing somewhere or swinging something because you felt like it. Have a plan of action, if it involves a teammate make sure to vocalize it (flash on my ping, swing with me, up down here with me, etc.). You should eventually get to mid Asc just from that alone.
a byproduct of that is that you will create better decision making skills and a better understanding of the game just by vocalizing. weather youre talking to your team for a play, or just talking to yourself because its not relevant to the team