What do you *actually* do in silver/bronze when your entire team feeds?

I know the huge "elo hell" stereotype, but sometimes carrying by going even in lane and having better farm is realistically not possible when you have a 1v1ing Yi or a 1/10 botlane. What exactly can you do in these situations? I always look back to see what I could have done, but normally what I could have done is attempt to help them and then die like they did.

I play the stereotypical Riv/Yas/ blahblah, I know how to carry with them from ahead or even very easily. However, as my other characters, Ahri, Veigar, and Sion, I have a hard time pushing even games to victory, let alone games where I'm insanely behind. I should mention that this is an issue with both normals and ranked. I work on vision, mostly, when behind and try to get as much as I can, but I'm only 2/10 wards.

inb4 play easier champions. I only play who I do because they are fun. I could care less about climbing, I just want to improve.