Need Suggestion What Role To Main and More

Hi all!

 So, I've linked my op.gg -- now keep in mind, not all of these games or champions were those I've considered going hardcore, merely wanted to test the waters. I know it's ranked and all, but I'm in Bronze at the moment and feel quite confident I could climb into Gold if I really started narrowing it down, but the thing is I'm not sure who - or what - I should narrow down to. 

 What i'm looking for are some suggestions as to what lane/role/champions I seem best at, or, considering what you think I seem okay at, what you would suggest that might be a more mainstream pick or perhaps a high skill ceiling'd one (i'm looking at you, Lux). I've ran into trouble - call it a wall - around 1700ish MMR (let's not talk about the rest of my history) with Lux when I used to OTP her as Support way back when -- apparently around the time bot lane players start juking, a lot. I don't want to run into a wall again, and if I'm destined to be a one trick so be it. 

 I feel like i'm a good mid - I really do. I usually win my lane, do some great roaming, sometimes we're even ahead but for the life of me I cannot carry those games. It seems like i'm just not good enough of a difference between myself and the other person. But, when I'm support, and it's me and some autofilled clown or idk, people who don't understand the matchups and spikes and when to freeze b/c the jungles coming or how to ward, I feel like I carry so hard. Now, ofc there's times I pick an enchanter and there's nobody to support properly, or I pick an engage (naut) and my adc never follows up b/c theyre asleep, but if I want to mage it down and meme I certainly can. 

 What I'm afraid to do is get walled out b/c i'm "cheesing". Kind of why I'm afraid to main an assassin mid -- I know this only goes so far before players stop being bad (Yi) stop falling for it (split push). I'll liken it to arena, Beast Cleave might slap some 1800 RMP but at 2500+ you're gettin' rick-rolled once they figure out the matchup. So, I dont have that type of experience in League and I'm looking for some insight and I don't have any high elo friends to give me the TL;DR this is what it is speech. 

THANKS!

<3