Best play style to get through low elo

I was a high diamond jungler/support a couple of years ago but unfortunately got banned. I've recently come back to the game and because of a new account I'm starting at a lower elo. The games seem 100x harder than the games I experienced in diamond before and I don't know what play style I can try to win. I've tried a lot of different tactics and not much seems to work effectively. Any advice on what play style to adopt to get through this horrible experience?
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