There's no such thing as a "carry" role anymore

Hate to break up the ADC nerf circle jerk but there aren't any solo carry roles anymore.

If you play ADC but get no peel or frontline then you're useless.

If you play assassins but your adc feeds then gl trying to kill that

If you play tanks but none of your carries are doing damage then hf slowly losing team fights and being unable to take any objectives.

I think the strongest role right now is bruiser/fighter/split-pusher types like who can itemize very tanky (getting about 70-80% of the tankiness of actual tanks) and still do about the same damage as ADCs. I consistently see teams with these champions doing well at all stages of the game. They can 1v1 anyone and they're still really good at team fights diving the backline or even peeling for other carries. They're kind of like a solo-Q swiss army knife that work in every comp due to their mix of utility, damage and tankiness.

But mostly, games are won in champ select. League might actually be Rock, Paper, Scissors now. Pick the right comp and you can just win every team fight because your combination of abilities are better than theirs. So I think if you want to climb the most consistently you should learn at least one of each class of champion to be able to pick for the team comp and dodge the bad comps you can't fix. There's one tricks but they're usually things like who fit that fighter/bruiser/split category I mentioned earlier. You can't go wrong with that type of champion. No one's one-tricking to Challenger if you know what I mean. And if they are they'll probably need 1-2k games to get the RNG of favorable team comps to complete the climb.

Hope this can help some people and make games less frustrating. Best of luck!