the only way to get out of any bracket/league/whatever you want to call it is to have a positive win rating.
sure you can get lucky and win 40 games in a row but gaining rating is slow work and takes
months. say you win 70% of your games, that is Forellenlord win rate right there, that means for every 10 games you play you will gain 4 games of rating (7 games won, 3 lost, 7-3 = 4). if you want to average it a normal game takes for the sake of math 30 minutes to play. 30*10=300. 300/60 = 5. so for 4 games of gain you should be playing 5 hours of LoL, assuming of course you're as pro as pro gets. most likely you aren't seeing as you aren't playing on a smurf and it will take you considerable effort to work your way out.
but on the bright side the amount of time spent fighting for small gains will make you a much better player rocketing yourself out of bronze in no time