Need helping finding a one trick...

So recently I've been more inclined to participate in ranked and thought finding a one trick instead of jumping to multiple champs would be a good place to start. I've taken a few champs into mind such as Ahri and Akali . Ahri i already know how to play pretty well and is who I started the game on, however I don't many see many people who really one trick her as she doesn't seem to be really good one trick material. I do find her a lot of fun but idk if I should look to one trick her. Akali is another champ I found extremely fun and like. She seems to be really high skill cap and is more rewarding to learn and better one tick material but I noticed she gets nerfed a lot so I don't know if I should one trick a champ who gets changed so often. I also looked into other champs such as Kai'sa and Xayah , kindred and Evelynn , or even someone as simple as lux . I don't really know who I should spend all my time on to try and get better at first and climb with so I hope you guys could give me some advice in picking, even if it's someone I didn't mention :)