Oh I know the 4th method thanks... Teamed Advantage
When you would have advantage on the attack roll or another enemy of the target is within 5 feet of it, you can exploit a foe’s distraction to apply a maneuver to a subsequent attack against the target enemy as though you had a combat superiority die.
OK that is too easy... and doesnt use up any of the resources of the fighter. hmmm hrumph.
edit: how about if not using light armor and weaponry teamed advantage is risky and grants enemy advantage on retaliation?