How do you practice after level 30?

I got to level 30 about 2 days ago and I gotta say, its hell here. I'm going up against Golds, Silvers, and I even had a plat in my match once. I either end up feeding, falling behind on a lot of cs, or just losing my lane early. Before it was just level 15-30s queuing with higher leveled players, now, the whole lobby's level 100+. You can check my for proof.
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