Redraw objective of scoreboard over old objective

So Im trying to make a scoreboard and everything works fine. However when I kill someone it draws a new objective. How would I delete the old objective and put the new one in? Because right now when I kill someone my old kill number lets say was 89 and when I kill someone it makes a new objective over it with the number 90.
Here is the non working code

Code:

    @EventHandler
    public void onMove(PlayerMoveEvent event) {
       
        Player player = event.getPlayer();
       
        String name = player.getName();
   
        Scoreboard board = player.getScoreboard();
       
        Objective objective = board.getObjective(DisplaySlot.SIDEBAR);

        objective.setDisplayName(objective.getDisplayName());
           
            String pName = player.getName();
           
            getConfig().get(pName + ".kills");
            getConfig().get(pName + ".deaths");
            saveConfig();
           
            int kills = getConfig().getInt(name + ".kills");           
            int deaths = getConfig().getInt(name + ".deaths");
           
            int kdr = (Math.round(kills/deaths));
           
            Score ratio = objective.getScore(ChatColor.GREEN + "K.D. Ratio: " + kdr);
            ratio.setScore(0);
           
        Score kills1 = objective.getScore(ChatColor.GREEN + "Kills: " + kills);
        kills1.setScore(1);
       
       
        Score deaths1 = objective.getScore(ChatColor.RED + "Deaths: " + deaths);
        deaths1.setScore(2);
       
    }

Here is the code that was working before. This code didn't have to make a new objective. All it did was change the objective's score.

Code:

    @EventHandler
    public void onMove(PlayerMoveEvent event) {
       
        Player player = event.getPlayer();
       
        String name = player.getName();
   
        Scoreboard board = player.getScoreboard();
       
        Objective objective = board.getObjective(DisplaySlot.SIDEBAR);

        objective.setDisplayName(objective.getDisplayName());
           
            String pName = player.getName();
           
            getConfig().get(pName + ".kills");
            getConfig().get(pName + ".deaths");
            saveConfig();
           
            int kills = getConfig().getInt(name + ".kills");           
            int deaths = getConfig().getInt(name + ".deaths");
           
            int kdr = (Math.round(kills/deaths));
           
            Score ratio = objective.getScore(ChatColor.GREEN + "K.D. Ratio: ");
            ratio.setScore(kdr);
           
        Score kills1 = objective.getScore(ChatColor.GREEN + "Kills: ");
        kills1.setScore(getConfig().getInt(name + ".kills"));
       
       
        Score deaths1 = objective.getScore(ChatColor.RED + "Deaths: ");
        deaths1.setScore(getConfig().getInt(name + ".deaths"));
       
    }

 

This does nothing. Either delete it or make it save the values.

1. Loop through all the contents of the scoreboard.
2. If the score is equal to 0 (the score you set for ratio), remove it from the scoreboard and break out of the loop.

 

How would I remove an objective?