Get accurate in your ability to click. Click minions accurately. Click the enemy accurately. You need to be fluid in your movement and combat before you can do anything else.
Once you have fluidity, you can then whip ass. But you can't whip ass unless you understand what enemy champions do, and what yours is capable of. This you only learn by playing a lot, for months/years.
You cannot climb ELO unless you WIN lane more than you lose lane. The above is how you win vs an opponent.
But you can't win the game without getting the objectives.
The point of killing players is to get objectives. The point of the game is not to kill players, but get objectives. Killing enemy players is just the means to getting the objectives.
The common flow of gameplay right now is like this:
-Get bot turret.
-While the enemy is recuperating from losing bot, your BOT lane then goes and gets the mid or top turret.
-After that, they then get the 3rd outer turret. This entire time the enemy team will be scrambling because your team is being proactive.
-With the gold lead from getting those turrets, your team will win any fights near dragon and baron. Once you have VISION control over dragon or baron, you take the dragon or baron. But don't take Baron unless you're very ahead, otherwise the damage Baron does to your team will allow the enemy to fight you evenly.
So to recap.
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Get fluid in the use of your champions. Play 3 champions only, otherwise you can never be proficient. Don't be a jack of all trades.
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Kill the enemy players so that you can GET the turrets and dragons and barons. Killing the enemy gets you a gold lead and makes them think twice about fighting you again. Use this pressure to get objectives. The enemy needs to be in a situation where they don't want to fight you, so they back off the objectives, but if their hand is forced, you likely win anyway because you were ahead of them.
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Convince your team to group and push the 2nd tier turrets. If the enemy is disorganized, you basically won by this point, because they will be running around with their heads cut off and flaming each other while your team takes tower after tower. Because you have a lead, if they fight you, you'll probably win the fight and get the inhibitor. The only case where this doesn't work is if they have a good wave clear mage who can slow down your team's 5 man push.
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While all of the above is happening, take the enemy jungle camps and ward their jungle as much as possible. Box them in their base. By doing this they make no money, they don't have a chance to come back unless your team does something really stupid. By doing all the above you've basically won the game at the 14 minute mark, even though the nexus doesn't fall until 30 mins. The above is why the game feels very snowbally.