The one key element to help you get out of bronze and silver!

Ban Yasuo and Zed, Not that they're op but you avoid the possibility of your team picking it, Because people at this elo(unless someone is smurfing which you notice by looking at their profile) are just horrible with those champions , They will feed or be useless 9 out 10 games, Because these are high skill cap champions and let no one lie you that they're good at them and theyre still bronze or silver.

good luck.