Can anyone high elo Please help me know What i ve could dane better to win this game

Even tho my team Tbh suck this game, i feel like i could make difference to win this game and at some point enemy team was 0/15 and i had the only kill of team, I still feel game was winnable and i would like to kn what i could ve dane better to win it. For those Who are interested im talking about darius game Where i finish with kda 18/6/5