I'm severely struggling in low silver

I've been playing since season 3 and I've rarely ever done this bad. I feel like the more I lose the lower I get and the lower I get the harder the game is becoming. I've been struggling to win over all and I'm becoming very unsure of what I can do. I'm no where near being good enough to carry a whole team or really myself. It feels like I'm just getting worse and worse and I don't know what to do. This is the lowest elo I've been since season 3 and I want to get gold for the first time since I've been playing. I really need help. I feel like the only way I can climb would be duoing with players higher than me but I want to be good on my own and not rely on someone boosting me up. I feel like this season I struggle to play in any role and do good. I play mid the most and probably adc as 2nd. They feel like my best roles although I can have phenomenal top games. For me I feel like I've always played better with higher elo players and play worse with lower elo i.e. bronze/low silver. I'm feel like I've exhausted all I can do by myself. I really want to become a better player and I feel like I can't do it on my own anymore :(