-Group with team and shove + destroy the other lane's outer turrets, while looking for picks on people who get too close (hence out of position).
-Ward around the lane you are pushing so you can easily respond to teamfights and engages (i.e. enemy Zac might jump in and ult).
-In a teamfight, look for a good CC (i.e. 5 man ults), lock down champions with CC to get kills, and peel your squishies using exhaust and CC if someone is on them. (Don't forget to use your active items.)
-Roam with team or adc to wreck other lanes.
-If the enemy team is dumb and is ignoring bot lane for the most part during and after you destroyed enemy bot outer turret, you can shove your inner turret and, using your lead, you can easily win the 2v2 teamfights/skirmishes and destroy the inner turret.
-Keep in mind the objectives by warding them or just by using map awareness (i.e. if all 5 of the enemy team are mia, they are probably doing one of the objectives, and you will be able to tell which one depending on how far ahead they are or how long the game has been)
-Follow your team if they want to do dragon/baron and ward accordingly, as well as destroy enemy wards