Actually practice wave management if you want to improve
- When You Are Winning Lane, Don’t Shove the Wave
Instead, try freezing the wave in the middle of the lane or near your tower. When you push the wave repeatedly to the enemy tower, you give them free farm instead of zoning them away from it. Every 15-20 CS is the equivalent of 1 kill, depending on the time in-game. By freezing the wave away from them when you are ahead, you either force them to stay under their tower and miss out on farm, or make them leave tower and potentially kill them when they try and farm. Freezing the wave is one of the things that most people in low ELO don’t do, yet if mastered, it is the single most tilting tactic in all of League. And on that same note….
- Don’t Push the Same Lane Over and Over
We have all had a Tryndamere or Singed split push all game, not join the team ever, and eventually die three times in a row because he won’t leave top lane. The enemy team will catch on about the third you try and push that wave, and they will be ready. Instead, try and push another lane, or join the team and wait until you win a fight to put pressure in a lane. By repeatedly getting killed by splitting, you give the enemy team free gold and always force your friends to fight a man down.
http://leaguegod-ish.com/10-tips-to-gain-lp-in-season-8/
I made threads on it before and I got drowned out. Seriously, though, any lane that's winning should freeze unless there's a real reason to shove (backing or trying to take turret). It starves the enemy of even more resources than having the minions die under their turret.

WTF WHY DO TANKS HAVE SO MUCH BURST!!!