So it sounds like your games go the same way most low elo games go, everyone groups mid and smashes their heads into each other.
Use your sightstone to light up one side of their jungle and red trinket to clear their wards in the same area. Have your team rotate between mid and the lane adjacent to the jungle with wards in it. Get as much damage on the tower but back off if the enemy team engages. Because you have wards in their jungle and they don't you have a shorter distance to travel between towers, allowing you to rotate faster. If they try to go through their jungle your wards allow you to get picks. That way you can avoid the 5v5 team fights that have been getting you killed.