I need more champs

Hey y'all! I want to start playing ranked matches but i only have 15 champions and,as you know, i need 20 champions to play ranked. I need more adc and top champions (i need these champs the most but you can advise me other champions for every lane) Can you help me? (P.s. i like to play aggresively and get kills but also carry my team if necessary obv)
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