Climbing up from Bronze

I started this season from Bronze 1, now i am Bronze 3 and still diving to the bottom. I get **consistently** horrible matchups where enemy team is way better at coordinating ganks, and calling objectives, on the other side, my teams are **consistently** bad at "teamplay", diving for kills and get killed instead, early jarvan gank that gives a kill and a blue buff to enemy laner, preferring to back instead of pushing turrets after an ace, etc ... What am i supposed to do to climb from bronze ??? is it now mandatory to have multiple duos to win a game ???
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