High Elo Junglers

So I had reached just Diamond 4, and would consider myself as an ok player (idk but I still feel like diamond 4 players are mostly boosted, hardstuck or plain trash). As a jungler I'm wondering what champions should I consider one-tricking or playing a lot in order to have a solid advance into D 2 or 1? I've tried champions like Nidallee and Rek'sai, but fail to carry with them. What makes these "high skill-cap" jungler so efficient and which ones should I try? Thanks.
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