Ranked Is Useless (For Bronzes)

There is no point in even doing ranked as a level 30. You need to have a full team if you want to get out of bronze. Ive been carrying most of my ranked games, and my team straight up feeds, someone goes afk, or our jungler doesn't know what a gank means. I know im salty right now, but when you've been in bronze for 6 months, getting to level 18 first while everyone else is level 12-15, its annoying! I carry every game, get the most CS every game, and I never win. Every time i go in a team fight, 3 of my team mates go in, 2 stay back and do nothing. Honestly its pointless, im bronze I right now, and am about to go to bronze 2 if i lose one more game.

My only suggestion to fix this problem, is that you can only play champs that you have a mastery skill in, in ranked. Kind of a bad suggestion, but, its the best i can think of that may actually work. People get to lvl 30 and straight up go into ranked with a champ theyve played with once or twice, then die 10 times in 15 minutes ruining the game.