How do I improve?

Hello! Apologies if I make some mistakes as this is my first post here. I am a support pllayer who is hanging between silver 3 and 4. If I was a new player this would be fine for me but last season I reached gold 5 before the season got over. I was doing really well back then and had a decent kda. This season I have no idea what is happening to me. I try everything possible to win games and rank up. But I have been losing games almost consistently. I seriously have no clue what I am supposed to do. 8 have read guides and watched videos on how to improve as a support. I even ward a lot that by the end of the game my vision score is almost double than my teammates. I seriously worried that if this keeps on happening I might be demoted to bronze. Please do take a look at my match history to point out what I have been doing wrong. My league name is ScubaKoopa on NA. Thank you in advance
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