Ok bud. Before I start offering my thoughts and tips I'll preface by saying I know how you feel. I was hard stuck Bronze III last season too. But I started improving my play towards the later half of the year and after getting placed in Bronze IV this season, I managed to climb into Silver pretty quickly.
So I understand how you feel and have been in your position before.
1.)
For the love of Teemo
STOP. BLAMING. YOUR. TEAM.
And also drop your bronze complex
Getting bad teams suck I know. But you simply can't blame 90% of your losses on them. Doing that simply gives you what I call Bronze Syndrome. I had it too. I always thought I was being held back by horrible teams. I never once put myself at blame and that mindset is very damaging. It just made me very frustrated with the game and look like a fool.
So just stop blaming your team for everything.
Also don't over value yourself. You're Bronze III with a 53% win rate. You'll most likely get stomped in Gold/High Silver.
2.)
STOP PLAYING RANKED
This may seem counter productive but stop playing ranked.
3.)
STOP PLAYING SUPPORT AND TOP
Just don't play those roles. Playing them makes climbing significantly more difficult.
4.)
STOP PLAYING 6 DIFFERENT CHAMPIONS
The best way to climb is by playing one or two champions. Playing too many is counter productive.
5.)
FIND SOMEONE THAT YOU LIKE, CAN EASILY CARRY, AND CAN PLAY MULTIPLE ROLES. ALSO MAKE SURE THEY ARENT TOO POPULAR
I personally chose Veigar. He isn't banned too often and nor is he played too often.
6.)
SPAM THEM IN NORMALS
Just play them until you can hit at least a 60%+ win rate (and mastery 7) with them.
7.)
PLAY THEM IN RANKED
8.)
PROFIT
BONUS TIP
FIND SOMEONE TO DUO QUEUE WITH.
Find someone reliable and duo queue with them. Now you can trust one less person to feed miserably.
Note:
I'm a Veigar main so I am obligated to yell at you for building Ludens.
Arch angels is extremely strong right now and fits Veigar perfectly. So start abusing it.
Rush Arch Angels.