Please, just please change something about the two options of playing this game.
Just how CS:GO gives you free armor in Casual and you gotta buy it in Competitive, please change something to distinguish Rankeds from Normals.
As far as I can see, many people say they play LoL just for fun, they do not necessarily care about destroying the enemy nexus as much as they care about doing whatever they want in the game (a.k.a. having fun).
So give them more fun in Normal games, change some items, add some other objective, just do something so they start playing Normals, cause I'm tired of people not trying in Ranked games and then just saying "oh well, I play for fun".
Give them fun in Normals, turn normals into Ultra Rapid FIre, do something !!!