Help Become a Better Player

Hey guys! I am Plat 1 and I really enjoy this game so I want to become a better player. I've been climbing fast but after reaching plat 1 I suddenly stopped. It feels like I even started sucking really bad at the game. I am even bad with champions I used to main. I feel like I've started making lots of mistakes I didn't make before. Personally I've never been a win lane, win game player but go into lane, be equal and win teamfights to win game. Can you guys please help me with some tips on how to go through laning or just be better at laning so I don't lose the game because of it.
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