Help choosing a main

Hello League players, Im a low elo player, Ive been climbing from bronze and achieved Gold today. I been playing around with a lotttt of champs while climbing and I feel things are getting a bit harder. Reading some guides and stuff the main advice I see is to focus on a small size champ pool like 2 or 3. I think the path from gold to plat will require just that but I have trouble choosing and figuring out the ones I should focus more, and that's why I need your help. I've been playing a lot with Yi, Khazix, Rengar, Lee, Zac, Warwick, Graves, Kayn and Elise. I do have almost every jungle in the game but this are the ones I can say Im familiar with. So Ill be waiting for your insight! Thanks in advance!
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