Best jungler / strat to break into Diamond

Title. Im a support (Sona only) / jg / sometimes top main. With Sona I got a 60% WR, while around 50% on average with Noc, Brand, Udyr, WW, or any FOTM jungler. Ended last split in Emerald 1, currently stuck at Plat 1.

I have good mechanics IMO… I pick up champions decently fast, and I think my current strength is having great macro (I believe, since it has helped me carry games with Sona a lot).

Whats the best champion or strat to climb into Diamond while maining jg? What lanes or objectives should I usually be prioritizing? I know a lot is on a case by case basis but what do you think?