The problem with Elo rating (or any other rating) is that it approximates your level based on every game you ever played since first picking up the game. Remember that your teammates and enemies have the same Elo as you. Which means that unless they are playing only at their best capacity, they can play like a much higher Elo player when they are focused and in a good mindset or play well below their ranking if they are tilted or distracted. You lost 7 games in a row to get into current rank, but it's just as likely that your teammates got there by losing 7 games as well. If you don't jump back up instantly by being so much better than anyone else at you rank and carrying every game, you are most likely not teamed up with players who bring you down but with player who fluctuate in ranking just like you. Again, your teammates and enemies have the same Elo rating, so if you are below the rank you are supposed to be, your team has a huge advantage in that match.

Elo rating was originally created for ranking performance of chess players compared to each other. It's not a common practice (or at least it wasn't before the internet) to play chess games back to back for 8 hours with no breaks, every day of the week. Elo is great at correcting small fluctuations, for example if a player was sick on the day of the tournament or couldn't get a good night sleep. When applied to rank-grinding LoL player, it completely breaks, because performance fluctuates constantly based on the time of the day, previous wins/loses, current mood, amount of sleep, even what you ate and when (hard to digest foods take blood circulation away from the brain and towards digestive system).

The best thing you can do is maximize the consistency of your Elo rating. If you feel tilted, tired, distracted or in any other way impaired, stop playing immediately. If you are the type of person that needs to win to get satisfaction from the game, have another game ready and play that instead. Get back into League only when you feel you can play at your best. This way you will be always paired with players comparable to your current level of play.

The purpose of having consistent Elo is not to climb higher, it's to get stuck at certain ranking. When player starts ranked play, most likely they are below their actual ranking. This means that you need to correct for every mistake your teammates make as long as you are climbing in ranks, because you are the strongest asset in your team. You need to be a leader and need to fill roles of other teammates if they are play poorly. But eventually you will get matched with people who know the game as well as you and who play the game as well as you. Then you start going up and down the ranking, seemingly unable to progress. When you fall down you can carry again and with some luck you can get above your actual level but overall, there will be a ranking you will hover around forever.

This is your Elo ranking. People with higher ranking play better than you. People with lower ranking play worse than you. This is your place and after how many ranked games you played, you finally gave the system enough statistical data to place you in the ranking where you belong. There is no Elo Hell, there is just Elo. If you want to progress further, the only way is to identify what you are doing worse than better players and to actively improve. Ladder in, for example, Hearthstone and many other games is designed in such a way, that to climb to highest rank all you need is 51% winrate and hours and hours of play. Even if you are a mediocre player, climbing is just a matter of how much you play and not much else. Not in Elo. In Elo the only way to improve is to improve and it should be expected that if you play enough games, you will eventually climb higher and higher. Best way to improve is to improve and nothing else.