to be blunt
Git Gud
Something you have to realize is league is a game of interactive chess
The better player will find ways to win in chess, however I will admit league is a game that will hold back good players with bad players. Even pros only average 60 percent win rates, on good days you will average 70 percent.
However after greatly examining my hundreds of past games this is what I have come to the conclusion to.
5 games- Should be easy wins, and gained with proper effort
1 game- Will be harder, challenging, but very winnable
2 games- Will be extremely hard, they will feel impossible, but if you are good, you will be able to carry
2 games- are border line guarantee losses for you will either be trolled or suffer a afk from a teammate.
I came up with these statistics by examining my own game and looking at diamond smurfs.
When I looked at Diamond smurfs I realized they only had a 80 percent win loss ratio, not a perfect 100 percent. When I looked at why I realized the 2 games they would lose were often the blame of hard core feeders or trolls.
So yeah
50% of your games you should always be winning
10% hard but if you are good you will win
20% Extremely hard
20% near impossible
However something you have to realize going back to a earlier point, EVERYONE IS USEING THE SAME SYSTEM YOU ARE, everyone is getting the same teammates you are, everyone is facing the same problems you are. Yet many people were easily able to get into silver, many people were able to get into gold, and the great were even able to get into plat or higher. Why is that?
Simply because they are currently better then you are. It sounds mean, but it is the truth, not to call you out, but I promise you, if I made a 5s team and you made a 5s team, my team would win way more fluently then yours. Skill does exist in this game, and you clearly, currently do not have the skill or game knowledge to get out of bronze. That is just the die hard truth. Bronze is easy to get out of, you simply chose a carry styled champion, get fed, and solo carry by killing all the scrubs and taking objectives. If you can't do that, then it means you aren't good enough currently to do that.
How does one "git gud"
1-Study players who are better then you
2-Watch streams of really good players
3-Have people watch and critique your mistakes
4-Constantly blame yourself every time you lose, look at each game and think DEEPLY on what you could of done better.
5-Read guides