How to rank up in League of Legends? [duplicate]

If you find that you are losing games because people are bickering, just keep playing games. Over enough games, assuming you are not an intentional feeder or the like, the enemy team has a higher chance of having feeders / ragers.

Mediation over your teammates is fine, but you will find that it doesn't always work. In that case, just ignore the arguing and focus on your own gameplay. Do not tilt.

In every game you play, focus on what mistakes you made (and yes, you made mistakes). I'm a firm believer in the notion that there's no such thing as being "stuck"; just the possibility of not playing enough games. If you've already played many, many games, then that's just an indication that you're in the correct rank and will need to improve before ranking up.