How to stop being bronze TODAY!
-Stop chatting. Entirely. The only keys you need to be concerned with are the ones that make your champion do things.
-Push objectives. Always. If there's no objective to get, do something else somewhere else.
-Watch your minimap.
-Ping early, ping often, ping always.
-Buy control wards. Use them. Even if you're mid or adc.
-If you're winning your lane, push your turret. After you get your turret, help one of your team mates get theirs. Rotate your gold.
-Narrow your champion pool down to 2-3 champs per lane. Spam those champs.
-Be a team player. Heroes never live very long.
-If you're fed, hand off kills to someone else. Spread the wealth. Don't be your team's single point of failure.
-Ward the enemy jungle if you're ahead, your own jungle if you're behind, and the river if its even.
-Learn to tell when you're ahead or behind. Play accordingly.
-Learn what items do. Grievous wounds wins games. Randuins beats crit builds (Yasuo, trist, etc.)
-Buy potions. Use them when you fight.
-Learn the meta. Exploit it. Don't play assassins in a tank meta. Don't play split pushers in a team fight meta.
-Watch the pros. Find someone who plays your favorite champ, and learn from them.
-Mute toxic players. Better yet, mute everybody. There is no strategic advantage to chatting that you can't get with just pings.
-Dodge games you think you're going to lose. 5-30 minutes and -2lp is better than 50 minutes and -20 lp.
-If you tilt, stop playing. You make garbage decisions when you're angry.
-Don't worry about anything your team mates are doing. You can't control them. Play your best around what they're doing.
-Don't ever expect your team to follow your directions, and don't ever get mad at your team for not following you. You are responsible for you.
-Don't ever criticize other players. Not verbally, not in your own head. Only criticize yourself.
-Go to OP.GG and check your kill participation per game. If its below 50%, you need to make some changes.
-Check stats at the end of every game. How was your dmg? How was your vision? How was your objective dmg? Now you know what to fix next game.
-Go to OP.GG and check your win percentage on the champion you're spamming. If its 50% or worse over 20+ games, stop spamming that champion.
-Don't play with toxic players. Even if they're your friend IRL. (this is hard.)
-Don't play more than 3-4 games in a row without taking a break. Fatigue is a real thing.
-Don't ever play ranked when you're in a bad mood or having a bad day. It WILL affect your gameplay.
-Try other roles in normal draft. It will give you insight as to what you expect from your main role, and help you play your main role better.
-Save replays. Watch them. Be critical of yourself.
Just a few pointers. Hope it helps.