1-Recognize everyone is either stupid, salty, or just playing bad, take advantage of this.
If you practice hard enough you will realize you are actually better, and smarter than your peers in bronze. Use this knowledge as a confidence booster, also use it to take advantage of your enemy team. Bronze is a elo where everyone is bad, so it allows you to get creative and to just go ham. It allows you the oppurtunity to get easy solo kills, it allows you the oppurtuntiy to heavily out farm.
2-Use step one to turn into a snow ball. Open the map
Getting a gold lead means nothing if you don't share the love with your team. After you win your lane, look for roams, ask yourself "which lane is the easiest lane to help out?" once you make a decission, camp the fuck out of that lane, and push for towers. The moment you get towers and end lane phase, you have now opened the map.
3-It's time to group
Once you opened up the map by taking a tower or two, make sure to demand your team to group. You have a gold lead, use it and abuse it. Over power the enemy team with your superior siege, you have more gold, you can win any team fight.
4-Never waste time, always look for what you can take after kills/picks
The moment someone is off the map, that means you now have what we call in hockey a "power play" a power play means, you have more people on the map than the enemy team, abuse that fact, and look for something to take. Can you get baron? Dragon? a tower? Always look for objectives, never waste time.
Minor tips
-Play champions who either have lots of cc, or lots of burst, cc and damage is what solo carries games, look for champions who offer that
-Remember to ward
-Constantly think in how can you punish your opponent
-Build path properly, don't waste gold on stupid shit.
from, a person who has never ended a single season in bronze, but started every season as bronze.
Season 4-silver
season 5-gold
season 6-gold (almost hit plat, but gave up after a bad loss streek)