1.15.2 Help with scoreboard team size

I'm tryna manage a plugin where it detects the last person on the team and gives them a boost. The plan is basically.

Code (Text):

   
    @EventHandler
    public void onPlayerDeath (PlayerDeathEvent event)
    {
        ScoreboardManager Manager = Bukkit.getScoreboardManager();
        Scoreboard board = Manager.getMainScoreboard();
        Team asgard = board.getTeam("Asgard");
        asgard.getSize();
       
       // if size is 1
        //find player on asgard
        //give them buffs
      //if size not 1
      //nothing
    }
    }

I know my use of get size is wrong but idk how to use it properly any help is welcome thanks!