People are out to get you

When you reach your promos you get there because you are doing better than your average and being set up to lose with shitty players who are also being set up to lose. However, if you raise your average mmr beyond what they can reach its a lot less likely that this wont happen.

In short you do not climb by getting a lucky streak unless you are REALLY REALLY lucky. You climb by raising your average gameplay to the point that even the worst shitters you get matched with are still good enough to get out of wherever you are. Even premades take MMR into consideration during matchmaking. Understanding this requires very little game experience in fact.

Timmy starts playing league Timmy starts ranked Timmy bombs his placements and gets put in bronze so his ranked MMR is complete shit Timmy plays alot and with an MMR of like 0 eventually just happens to win like 6 games in a row and then does some stuff right because his favorite champ is strong this week. Timmy with an MMR of like 10 enters into promotionals with a team full of lucky bastards just like him with shit MMR Timmy is just rolling dice with what teammates he gets so he gets a bunch of shitters Timmy goes crying to the forums for the next 10 years about why he can never escape bronze because of trolls which are in fact out to get him

Johnny, a serious gamer, starts playing league Johnny starts ranked Johnny bombs his placements and gets put in bronze so his ranked MMR is complete shit Johnny plays alot with an MMR of like 0 but focuses on improving his gameplay instead of worrying about getting to the next rank because Johnny understands that even if he gets good at bronze that doesn't actually make him ready for silver or any other rank. He eventually wins like 6 games in a row and goes into promotionals Johnny goes into promotionals with an MMR of like 10 But Johnny understands that until his average performance raises his MMR higher that he is just rolling dice with his promotionals and knows this is why he will very probably get shitters at the peak of his streak and itll only get worse. If nothing else johnny's body is more ready than timmy's for the shitters Johnny understands that promotionals mean nothing if you aren't at a place where you have a lower chance of getting shitters and thus tip the odds in your favor. So instead of running to cry on the forums Johnny puts on some spandex and a cape then goes out to fight some crime because he's fucking batman and will get laid EVER

Everyone is out to get you and if you reach your promotionals with less than the best odds then you will get shit on. If all you did was get lucky after a long loss streak then fuck you, you're probably getting thrown back in by trolls. Promotionals are when the trolls come out because

1. you're nervous and actually paying attention for once
2. because everytime you win a match the odds of the next match going to shit get higher and higher because you get matched against people in the same situation as you and you also get matched with people who are more likely to do something stupid. The extremes grow basically.

Everyone else has the same problem. But there is a tool to help you, an invisible one. Your MMR. You can be bronze with higher MMR than silver players and it used to be possible to have higher MMR than gold, that may still be true though that kindof says more about the gold player in that case. Be like Johnny, your promotionals aren't really your promotionals. They are crap shots with a chance of promoting you where you have the power to tip the odds in your favor by regurlarly not being a shitter like Johnny did rather than merely getting lucky sometimes like Timmy.

Be like Johnny, know what you are actually up against and what you need to do. Being good at bronze does not mean you belong in silver Reaching silver only means you beat bronze, it does not mean you belong in silver Playing like a silver player will not help you get out of bronze, that's like playing Mario to get good at sonic, two different games with some similarities. Diamond players do not escape bronze easily because they are diamonds, they escape easily because they consciously or unconsciously understand adaption, non-adaptive will still get stuck in bronze. Master teir players sometimes get stuck in bronze but know to consciously pursue a new train of thought specifically for winning in bronze.

Garen is in every bush even if nobody picked him Ahri is hawt Everyone is out to get you, especially that nice guy who jokes around with everyone at the beginning of the match, don't trust that fucker, he'll be the first to turn on you if you make a single mistake Escape velocity scales with general consistency Exploitation and one-tricking are valid strategery as long as you aren't literally cheating