Lose streak , platinum 5 trollers and feeders

Hi , my summoner name is nani27 i play on eune server and my rank is platinum 5. I play league everyday for 8-9h and more , but i can’t win my solo/duo ranked games if i can’t do penta kill or if i can’t split push on one lane , i think it’s not low elo game like silver and bronze where they doesn’t look on map and i split push with my udyr all lane and win the game , anyone with same problem ?