leaderstats not changing when I touch a part?

I am making a script where when I touch a part it changes other part's properties, then it is meant to change my leaderstats Stage Value to 1 if it is on 0 else do nothing, after that is some more propertie changing.

game:WaitForChild("Players").PlayerAdded:Connect(function(plr)
    script.Parent.Touched:Connect(function(hit)
        if game.Players:GetPlayerFromCharacter(hit.Parent) then
            if workspace:FindFirstChild("Walls", true) then
                local wall = workspace.Walls:FindFirstChild("Wall4", true)
                wall.CanCollide = true
                wall.BrickColor = BrickColor.new("Really red")
                script.Parent.CanCollide = false
                script.Parent.BrickColor = BrickColor.new("Really red")
                game.ReplicatedStorage.NightSky.Parent = game.Lighting

                if plr.leaderstats.Stage.Value >= 0  then
                    plr.leaderstats.Stage.Value = 1
                else

                end

                wait(15)
                if workspace:FindFirstChild("Walls", true) then
                     local Wall1 = workspace.Walls:FindFirstChild("Wall5", true)
                     Wall1.CanCollide = false
                     Wall1.BrickColor = BrickColor.new("Lime green")
                     game.Workspace.Enemies.Dark.Zombie.WalkSpeed = 0
                end
            end
end
end)
end)

Idk if this work but you can try

script.Parent.Touched:Connect(function(hit)
if hit.Parent:FindFirstChild("Humanoid") then
	local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	if game.Workspace:FindFirstChild("Walls", true) then
		local wall = game.Workspace.Walls:FindFirstChild("Wall4", true)
		wall.CanCollide = true
		wall.BrickColor = BrickColor.new("Really red")
		script.Parent.CanCollide = false
		script.Parent.BrickColor = BrickColor.new("Really red")
		game.ReplicatedStorage.NightSky.Parent = game.Lighting
		if player:FindFirstChild("leaderstats").Stage.Value >= 0  then
		player:FindFirstChild("leaderstats").Stage.Value = 1
			wait(15)
			if game.Workspace:FindFirstChild("Walls", true) then
				local Wall1 = game.Workspace.Walls:FindFirstChild("Wall5", true)
				Wall1.CanCollide = false
				Wall1.BrickColor = BrickColor.new("Lime green")
				game.Workspace.Enemies.Dark.Zombie.WalkSpeed = 0
				end
			end
		end
	end
end)

nvm I fixed it