after playing/stopming some plat3-d4 players

its a bunch of little things/big things you can do to win games ill give you a few and you can add me if you want some more tips i not only play but watch alot of league and have had alot of coaching sessions besides having the mechanics and prediction to hit your spells (dont play skillshot champs or easy ones like ori ) but it depends on matchups and team comps vs the other team for example try to counter your lane and try to have a big impact if im playing zed i want to try win my lane as hard as possible and roam as much as possible, even if i cant win or kill my lane then you want to roam as well.

tldr: depends what role you play/ champions but learn how to play them and position roam help the team as much as possible get use to moving your champion learn the emotions of the game, how to read your opponent and know what he does b4 he can do it learn how much output and input your champion can take learn how to farm most important thing in the game learn how to harass while farming learn matchups so you can know when you can trade learn how to build properly. every game should be different and situational learn to not rage and lead your team by pings and objectives learn to play from behind alot of games you can still win by positioning/making correct calls and picks play easier champions till you learn the roots of the game ward

all of this is why he is diamond and why you are stuck in bronze a diamond player will do all of this put together, if you have good mechanics you could get to diamond 5 atleast as well. keep learning and you will get there when you start to check these things off your list that you learn you will watch yourself rise gl (: