No matter how much it may seem like elo hell exists and how much it may feel like the rank you have is always what you deserve in League of Legends, there is no such thing as a guaranteed promotion and the rank you have is always what you deserve.
There are a lot of factors that can affect the result of your game, but just because it seems impossible to win now doesn’t mean it can’t be won later. If you’re not making progress, you have only yourself to blame, therefore the first step toward improving is realizing that you’re not doing your best.
You will face better players than you, and that is super normal; there is no need to start giving up on the game or saying that the player is boosting and that you will report him, he is just better than you or you did something wrong that made him take advantage of you.
If you’re dominating your lane, you shouldn’t relax and assume the game is over; one mistake can wipe out your entire advantage. This is why it’s important to maintain your focus and make the most of your situation, even if you’re ahead. For example, if you and your opponent both have Teleport, he’ll have to use his so he doesn’t lose farm while you’re on top.
It’s also important to have map awareness in League of Legends, so don’t point fingers at your teammates for failing to ping when the enemy is out of sight. You can buy valuable items like wards and vision wards from the shop, and they’ll come in handy during the match.
Finally, all it takes to go up the ranks is a single-minded dedication to the task at hand from the opening whistle to the final buzzer; anything can happen during the course of a game, and even if you come out on the losing end, you can always learn from your mistakes and make improvements.