to get better, you play.
Until you meet an invisible boundary that blocks you from gaining any more skill.
If you manage to fuck that boundary like you're supposed to, then you become me.
Teach me, how do I rape dis barrier?
Analyse your mistakes, and try different playstyle. Play champions that are good, or something you can carry with.
In my case, as I'm mid player, I go for ahri and orianna, or lux as they're viable for soloq.
Don't do same mistakes twice, and watch streams of good players from time to time, so you can get a little better by doing what pros do.
Here you've got an example of what you could try:
https://www.youtube.com/watch?v=FV8p4ozLiTk
basically, you go for udyr top, but you go to their red/blue and steal it, using red pot for 350 + 3 hp pots. Then either wait for jungler to arrive and own him, or kill your toplaner, while he's still level 1, and you are 2.
I personally do this very often, as it's overpowered on early, two hitting enemies in first minute.