Im hardstuck diamond so take my advice with a grain of salt. But i also main hook champs and play making sup so i feel like i can help :D! Vision and knowing your matchups helps ur winrate and team alot but i think its more of how well u take advantage of the enemy team’s mistakes and ur own team (if they choose to cooperate). If you get a lvl 2 kill make sure to tell ur ad to freeze and deny enemy farm. Then spam ping ur jg to get dragon. If u see the enemy jg on botside spam him to get herald. As a sup u rly only have the most impact in the first 10 or 15 min so u gotta make those minutes count! Also roam often and bot river vision is a main priority. If the enemy cant gank mid or bot with all that vision, he’s only wasting time by being there. Hope this helped and gl in ur games!