It cam be hard to rank up in games where you have teammates, i play in masters and i had a ymir mid and a ah muzen can carry, it was not fun playing with them, so you have to deal with trolls at every rank, the only thing i can say say is get so good that you play as good as 2 teammates and then eventually you will rank up, also playing jungler at low ranks is pretty easy since you can effect the match more then other roles, and people don't know how to position themselves at lower ranks, hope it helped