Which champ should i learn to fit my current picks weaknesses?

Need some suggestions. Hi, im plat 5 main adc. Currently my mains are kog, trist and i really like xayah so i will main her. Which adc should i start to play and master next to cover what the other 3 do not cover? Meta suggestions are to exclude, because it's preseason. Possibly only plat 1+ answers
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