Let me give you some strategy tips.
1.) At the end of the day make sure you are playing your best. Practice your mechanics before entering your promos. Play your best role to the best of your ability. You directly influence your prospects of winning 100% percent of the time. You are the only constant in a pool of variables. Make sure you dont become a hindrance to your success.
2.) Talk less, play more. It is not worth acknowledging allied members mistakes, or pointing them out. It is solo queue, its a waste of time. Reducing your teams moral or making allies defensive will only cost you late game.
3.) Hit the enemy where they are weak. Your goal is to drive a wedge into the enemy teams teamwork and moral.
Killing the jungler repeatedly: prevents enemy ganks to your lane.
Killing the bot laner: prevents them from participating in team fights.
Killing the support: prevents bot lane from coordinating.
Killing top laner: will aggro enemy junglers attention.
Contesting enemy team buffs successfully: throws off the jungler.
The moment you see that all chat message, "so & so is feeding report him" is when you know you can start grouping up and just look to close the game out.
Where skill doesnt work, play the mind game to win.
4.) Memorize basic strategies.
If you just had a successful gank to a lane and the enemy teleports back, and your allied laner is still relatively healthy, just dive the enemy again.
If someone doesnt have a summoner, keep fighting.
Use your wards actively, and dont be afraid to leave lane or counter jungle.
5.) Pick meta champions when you think you've reached a peak for your mechanical skills for the time being.
