How can i carry

I was originally a silver player and i gave my account to a friend ( i know its against the rules) and i stopped playing and by the time he stopped using that account and he gave me back , it went up to gold 2 (i swear i wasn't boosting).Now my placement i thought these gold players are good so i dont want to mess up and i only play support (im a support main) but in the games , i realized that these people are just so random if you are lucky enough to get a smurf on your team,you win.If not these guy will feed their asses of.For example i was janna and my adc was xayah we did pretty well in lane she was 4/2 and i was 0/1/4 but when i look at the teammates.Top was 1/8 (Aatrox against Nasus) which is immposible to lose early game and so on.So now i decided to play mid (Lux) cause she is a safe laner and i play her very well.My score is positive and i dont die,I ward (normally but not a lot ) but my team is just getting wreck and no pinging,the support bard was top at 7 ganking.Bot has ward in the bush and jax was in there but they cant even see jax.Im not saying these people are bad, im just saying what can i do to win as a support or what can i do to carry as a mid laner ( i have 50%+ Kill participant , 150cs in 20mn which is not really good but decent, I usually die less than everyone in team if i play mid ) [Please do not say Cuz u suck u silver scrub u cant go in to gold cuz u suck go kys ]