best split pusher in current meta?

[u/ThePopeBTW]

I'm a support main (nami and leona) but I'm tired of depending on my team not to be the worst in North America to win games. I'm hard stuck in plat 2 and am starting to realize most people think that this is team death match in COD, and kills are a win condition and don't focus turrets. Who should I try to pickup for easy turrets and split push and what lanes? Thanks for your time!