As swain, Do not team fight in the later parts of the game unless your Zhonya's Hourglass and Ultimate R are both up. Delay / disengage fights if the enemy wants to fight you.

Stay with your team in the late parts of the game. If you get caught out, or the enemy initiates a fight while you're not there, the enemy will win the team fight.

Poke and delay team fights while you and your team harass the enemy and get them low. Once they're low, engage. You can also look for picks with your abilities to catch someone who is out of position. As swain, Do not fight as a team in the later parts of the game unless your Zhonya's Hourglass and Ultimate R are both ready. Delay / disengage fights if the enemy wants to fight you. Stay with your team in the late parts of the game. If you are caught out, or the enemy launches a fight while you are not there, the enemy will win the team's fight. Poke and delay the team's fights while you and your team harass the enemy and knock them down. Once they are low, engage yourself. You can also look for choices with your abilities to catch someone who is out of position.