How to Solo Carry Silver and Gold elo as Kaisa by taking objectives?

Im a kaida main and i win lane most of the time. however, my team doesnt group or splitpush or push in general. the games get long and death timers are long to the point that 1 teamfight decides the game. i cant push on m own cuz im so swuishy. how can i solo carry and bring my lead over to other teammates??
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