Welcome to My TED TALK

So recently, I heard one of my friends talking trash, saying that "I'm the best one out of all of us, anyone else that I've played with is garbage." (Yes, some of my friends are toxic in league but I'm not going to drop them for this) I'm not one to take insults but hearing this, I realized that he was right, I need to better. I'm not a professional player or even plan to be one but I just want to somewhat seek approval that I'm better. Time constraints, personal business, all of these things play a role in my time of playing league. I'm only a bronze 1 top laner, but like always, ranks don't mean everything. I'll admit that I'm not fantastic or excellent however, I'll say that I'm decent. Going back to the point of this, I want to know HOW I should get better, to the point where I can be better than him. I've watched my own replays, watched other professionals play, guides, and more. I just want to be at a point where I can stand a match between someone greater than me, such as a platinum player. Any tips or things I should know in order to help my quest to seek approval? I'm not looking for a coach or anyone to talk to as I don't care about that; I only want to strive for improvement.

[garen-swing] Please only add important things I should take note of

Thank you for reading this and for the help.