Tryndamere doesn't need buffs, he needs a rework. His theme does not match his gameplay.
He shouldn't be afraid of conflict he should thrive in it. His thematics and lore suggests that he is a battle hardened force of nature on the battlefield but his gameplay revolves around him avoiding fights and passively split pushing as much as possible, and only fighting when he can pick someone off who can't defend themselves.
Does a barbarian who traveled to all the tribes of the freljord and bested all their greatest warriors sound like someone who runs from a fight? See thats my point, and that is why Tryndamere should be reworked into a better team fighter.