Just a quick glance at your recent games.
You play too many champions and too many roles. Pick 3 champs in the same role and play them every game until you master them. Have one backup role that you can handle without a lot of practice.
You die too much, I see a few games where you won and had almost 20 deaths. That should never happen, you are getting carried too much. Dying is much worse than getting a kill. Trading your life 1 for 1 is almost always a bad idea unless you are miles behind. If you are even or ahead it is not good. Protect yourself more.
Your warding isn't bad but it could be better. 16 wards in a 30+ minute game isn't great. Vision is knowledge and it is the most powerful stat in the game. If you are jungling you need to be dropping wards in the enemy jungle regularly for knowledge of their movements and to set up ganks.