I main adc and ive come to realize its nearly im possible to solo carry if the other lanes get super fed and just dive hou Maybe i need better posistioning.
Ive been told top and jungle are best roles to carry with. In your opinion whats the best role to carry with.
Mid is number 1
Jungle is number 2
Support :D
Jungle and Mid. Jungle for obvious reasons, you have the most map pressure. Mid also for obvious reasons. Second most map pressure given top and bot are close by (relatively). you can also just win your lane hard oppress the other laner to the point that they can't cs and threaten first tower gold, drawing pressure mid. (their support roams to you, their jungler roams to you) Which means you have an enemy adc all by themselves with your jungler + bot + support able to dive if the enemy team roam too often or it's too transparent.. Top lane works similarly. You destroy your lane opponent forcing their jungler to come by threatening first tower, then you double kill them if you can or just generate that pressure so your jungler is free to get dragons and gank bot lane. The main difference between mid and top is you don't have the advantage of being near two lanes, so may have to blow TP to influence the map.
TL;DR main mid and jungle for map pressure.
Most roles as long as you win your lane to the point that your win in lane is affecting other lane through you roaming or otherwise
Obviously jungle has easier time impacting lane but if you go 7/0/0 in your lane in 10 min and you start roaming to another lane helping them...
whatever the role. the best champ to carry is 
Jungle
https://docs.google.com/spreadsheets/d/1ub-VpK4bpGjDU6xGTtB5un6vqWlxyTezcL4SqTVLZp0/edit?usp=sharing
So far for my season, it appears to be support. But I only really play it when I am autofilled to it, rather than because I do well in it. I took a break for like 9 months before coming back to League and am still trying to find my niche again. Clearly its not at ADC haha
Mid and jungle have the most agency over the course of early and mid game. They have better access to roam and control the map.
yasuo. top. or mid. I think it's more of a champ thing than a position, you basically need high mobility, some cc and doh damage. a riven top obvious riven main and smurf won us a game solely with her roaming, they were barely in their top lane and still had more cs than the enemy garen. At times walking from base to gank a lane, then tp'ing top to still defend the tower. Whether that tower lived in the end, it didn't matter, we got plenty of other towers and the nexus. Constant and successful ganks enabled all team mates and no one can stop a snowballed riven.
ADC followed by support.
A decent ADC carries games with relative ease. Dominate lane, take turret, roam and take more turrets.
Supports may seem like an odd choice, but a roaming one becomes a secondary CC powerhouse jungle. Nothing beats a Leona waltzing into mid lane after a double kill on bot lane.
I disagree about ADC not being able to hard carry. I've seen high elo Ezreal players hard carry their team when they were down 15+ kills and dominated for the first 20 minutes.
