Anyone got advice for smooth(not jittery) player.Y restriction?(Will explain below)

I'm setting up a swimming system where you can't Swim past the OceanLevel(being the Y height of the water maximum) As it is, its really jittery and I've tried ways in making it smooth(no jittery motions) but its always crashed the script(not the game)

OceanLevel.Value = -12.1 Angle is the Y angle of the players camera movement.(whichever movement) == 1(means true) Feel like its the way "Player.Character:MoveTo" works that makes it jittery but that's a personal assumption

if (script.IsSwimming.Value == true and Human.Position.Y > OceanLevel.Value and angle >= 0) or 
       (script.IsSwimming.Value == true and Human.Position.Y > OceanLevel.Value and angle <= 0 and movement.backward == 1) or 
       (script.IsSwimming.Value == true and Human.Position.Y > OceanLevel.Value and angle <= 0 and movement.upward == 1) or
       (script.IsSwimming.Value == true and Human.Position.Y > OceanLevel.Value and angle <= 0 and movement.upward == 1 and movement.forward == 1)
        then
        Player.Character:MoveTo(Vector3.new(Human.Position.X, OceanLevel.Value, Human.Position.Z))
    end

Any advice/tips on fixing this would be a great help!