Easy Win - Meat Meta
Pick 3 Tanks, one adc (any will do), and Sona or Soraka.
Make sure Tanks take Strength of Ages Keystone, + Tenacity + Bonus Armor/MR + Bonus Lifesteal/Regen Sona/Soraka take Windspeakers Keystone
On the 3 Tanks with 2 exceptions build:

For Cho Build:
For Trundle Jungle build:

Now, use all 3 Tanks and destroy all the Turrets on the map together. Your ADC can split push because the 3 Tanks are always at Turrets. If Tank gets a bit low, disengage. If you can regen, just disengage temporarily. Use all CC you've got to keep the enemy at bay while you destroy Turret.
Next step, recall if you can buy more tanky items, or rotate to another lane and take next Turret.
At 20 mins, 5 v 3 can't kill 3 Tanks, the Turret isn't a threat, it's just a buzzing fly barely doing damage. If you get low, just walk away, use the build in disengage [Garen Q, Cho Q/W, Tahm Devour, Trundle Pillar, Zac Slingshot, Poppy R, etc. plus some have major damage reduction (MaoKai, Alistar)] and literally just walk away, heal up and come back and finish Turret, don't dilly-dally, take the turrets.
That's it. Can't stop it. You know why? Cause they weakened the Turrets and added major buffs via Keystone and Utility Tree (plus Sona/Soraka shields and heals and increases stats more, same with using Alistar as one of the Tanks).
Here's what you can pick from:

Yes, you could do that before, but now with weaker Turrets and new Masteries/Keystones, this is ridiculously easy.