Alternating between walking animations?

I have a script that places the player in control of a custom character with a walking and idle animation. I'm trying to have the walking animation change based on the status of a string value. When I change the string value, Instead of playing the alternate walking animation, the character just plays the idle animation. Thanks for any help.

wait(1)
local player
while not player do
	wait()
	player = game:GetService('Players').LocalPlayer
end

function onSpawn()
	local char = game.ReplicatedStorage["New Player"]:Clone()
	local SpawnLocation = game.Workspace.SpawnLocation
	char.Parent = workspace
	char.Name = player.Name
	char:MoveTo(SpawnLocation.Position)
	
	local prevChar = player.Character
	wait()
	player.Character = char
	prevChar:Destroy()
	
	if char:FindFirstChild("Humanoid") then
	char.Humanoid:Destroy()
	end
	local human = Instance.new("Humanoid", char)
	char.Archivable = false
	human.WalkSpeed = 8

	human.Died:connect(function()
wait(1)
		onSpawn()
		wait(.1)
	player.Character.Humanoid.Running:connect(onGround)
	end)
	
	--Player Values
	local move_left = false
	local move_right = false
	local already_ran = false
	local grounded = false
	local idleAnimation = Instance.new("Animation")
	idleAnimation.AnimationId = "rbxassetid://317651678"
	local runningAnimation = Instance.new("Animation")
	runningAnimation.AnimationId = "rbxassetid://319211805"
	local R2 = Instance.new("Animation")
	R2.AnimationId = "rbxassetid://319228239"
	--local I2 = Instance.new("Animation")
	--I2.AnimationId = "rbxassetid://319228239"
	
		
	function playAnimation(parent)
		local AnimTrack = player.Character.Humanoid:LoadAnimation(parent)
		AnimTrack:Stop()
		wait(.1)
		AnimTrack:Play()
	end
	
	function onGround(speed)
		if grounded == false then
			grounded = true
		end
		if speed > 1 and player.PlayerGui.SwordPlaySystem.Stance.Value == ("Left") then
			if already_ran == false then
				already_ran = true
				playAnimation(runningAnimation)
				
				elseif  speed > 1 and player.PlayerGui.SwordPlaySystem.Stance.Value == ("Right") 	then
					if already_ran == false then
						already_ran = true
						playAnimation(R2)
				end	
			end 
		else
			already_ran = false
			playAnimation(idleAnimation)
		end
	end
	
end
	
onSpawn()

	player.Character.Humanoid.Running:connect(onGround)
	

So.

1. What EXACTLY are you asking for?
2. Have you checked for any script that causes lag, or too many parts?
3. Have you tried using a anti-lag plugin such as Ro-Defender?
4. Is that the ENTIRE code? Is there a function at the start?