Looking for a new main (wants suggestions)

So in this preseason i've been _Decent_ at best. My previous mains from other seasons haven't proved successful to me recently. I used to play alot of shaco, riven. Yenno, champions that everybody hates. Maybe its the runes, but i cant find success on those champions anymore. I have been enjoying champions like Shen, Ziggs and xerath recently and managed to hit Plat 4 then get demoted soon after. So what im looking for is not necessarily easy win OP champs, but champs that after about 50 games you can really improve your skill with. I also want a champ that is fun to play TLDR; Looking for a new main that is -Fun to play -Easy to learn -Hard to master -Not suffering during the preseason patches
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