Once you play thousands of LoL games and you are still playing at a low elo, you may need someone who is skilled enough to tell you what you are doing wrong. A coach is not always the right idea because he doesn't always have a high level. You maybe don't know how a Challenger player he can help you, here you can understand how.
Get an higher elo on LoL
There are many advantages in playing with Challenger boosters. The most important thing is that he can coach to tell you how you can snowball easily in low elo. He can do it by showing new tactics and synergies that you never imagined. When you don't want to stay too long in your elo, they can play with you to make your games less unwinnable.
Fastest solution to boost your elo
Masters, GrandMasters or Challenger players are playing League of Legends for a longtime so they can play and win almost every games in lower tiers. He doesn't need weeks to get your account to an higher tier. An elo boost in Duo queue is maybe more expensive but it is with no doubt a cool experience.
Getting better after the boost
After a boost, it maybe feels like your performance won't be great, but thanks to the booster, you won't fail as much as before. Indeed, Your movements will be improved and you will not take the same decisions that you would have taken da ay ago.
You can only get better after talking with a better player than you, so why should you wait? You maybe tried to watch your games in replay and you still didn't improve, so it's maybe the time to try another solution.