How to get out from bronze

First, you need to grasp the game. Ask yourself what you did wrong.
Did I last hit all the cs?
Did I play right and not feed?
Did I use my main champ or trying something new?
Do I know the builds on this champion without searching on the internet?

I think the most basic part of the game is important. On higher elo, you need more advance Macro, Micro, and Map awareness to be a better player. Also another part is you need to use a high end pc (60+ fps is good) for a better movements in-game.