Focus objectives.
I find all to often when I am ahead and my team throws that typically they start throwing because they are kill hungry and want to get more of a 'lead'...this is a wrong strategy.
I had a game where 20 minutes in we thought they would surrender, we had a fed yi, yas and I as mid lane was pretty fed.
yas and yi continued to tower dive for kills they couldn't get. They would chase the enemy udyr for HOURS 'cue chicken runnin music* because he was an 'easy kill' as they called it.
Kills are used to get gold early game, Once you get that early lead, have your entire team come mid to push the first tower down real quick, then have them all leave to their lanes to hold. Next time you beat your enemy mid, call the jungler to your lane to push out that second turret.
Turrets get wins. Not kills. In the end it doesn't matter how fed you are, its how your team can communicate and you and all of your team members might be able to win their and your lane. But if you cant come together and work well in a team fight, the enemy team is going to win every time.
Dragonss...
Now...when you have a 21/11 lead over the enemy the dragon (in my opinion) isn't important...
Let the enemy get the dragon...it only helps them push (right???what exactly are dragon bufs and what do they do?)
because at that point with your 11 kill lead, you could easily single the enemy out (dunk/1v4) wiht a little bit of vision before they even get a chance to push.
Visions...
vision is important. if you are support you need to buy a sightstone. It WILL help. because you will know where your enemies are. YOu can spot a 200hp lb recalling in their tri bush...boom...easy shut down gold, why? because your sup happened to put a ward there. its easy. sometimes as support I will go out to the map ONLY to place wards, recall, then put out 5 more wards on the map (7 if you buy 2 pinks too)
ward placement:
theres a tutorial i watched and i did an experiment one game and it actually worked. Do you know the difference between pinks and greens? (wards?) if not look it up or ask and Ill tell you but im assuming you know. greens will always technically cost you about 25 gold, pinks, if left out on the map for longer then 4 min, start essentially 'earning' you gold. (had you placed a green instead of a pink you would be losing gold) ( i learned this all from a youtube tutorial on warding. I'm sure youcould look it up yourself because Im not suure 1% how to explain it) BUT...if you put a pink ward in the enemy bush that is behind the wolves on blue side. (the pathway that leads to baron/dragon closest to mid lane) AND then you put a ward in the bush BEHIND red....you should have vision there for a decent amount of time.
I actually did this one game at about 6 minutes in.
and the ward by wolves (behind blue) was gone in 20 seconds. (which means that their jungler was JUST there.)
and the ward that i placed after that (behind their red) stayed there till about 30 minutes into the game...that is 24 minutes of CONSTANT VISION ON THEIR RED.
the reason's that these bushes are ideal is that alot of time's they're never checked. no-body ever erally walks through them unless they go to hide or are actually checking which...when you jung do you check for pink wards in your jungle? because I dont...lol.
EARLY BARONSSS!!
If you win an early team fight (lvl 13/14 ish) an dyou have time to baron (and you have a lead that makes you strong) GO GET BARON.
This is risky, always...because baron is a hard mf to kill...but if you can get him and KEEP him you'll have another MAJOR winning advantage.
Lastly...JUST STAY ALIVE AND COOPERATE WITH YOUR TEAM.
the WORST THING for you to do is run around the lanes trying to farm/get kills/push.
You should have 1 person top or bot splitting (farming) and the rest should be running TOGETHER (later game lvl 15-16). always have a plan. don't just run around until your team is mid. Make a strategy first.
the jungle (if hes fed enough) can wonder on their own but the mid, adc and sup should go mid.
That way you're forcing then to defend their mmid AND their top/bot. (if they don't do both they'll lose one or the other) and if your splitter is able to kill the defender top or bot. boom. you win that turret. or at least on turret becAuse others fromm mid are going to have to defend.
If all of your team mates are scattered abuot the map..son'a top warding, adc jinx is bot farming, mid is mid defending, and jungle is jungling still, lets say top is buying...where does that put your team in team work? the enemy is probably grouping mid ready to push throug hyour first tower while your team is doinggggg???? what?...nothing...
so just amke sure that you don't lose yourself in game. stay with your team. i fyou need some farm then farm while the enemy is down. idk just throwing idea's out there.