I build to Splitpush/Movespeed. You are just not gonna kill someone/a team with a 1-2 levels above you & 2k gold lead if skill is equal. At that point, you are only praying for them to throw and if you are higher than silver its gonna be a real slim chance.
E.g. Hydra/Sunfire bruiser or Triforce+Shiv ADC. Homeguards+Mobi's on both.
you most likely still won't win but at least you can maintain some control of the map with map pressure vs praying for a throw.