Gui/text does not work and responds. Can somebody explain to me why?

Does somebody know why the text gui does not work? I would like to come up with a gui for 5 seconds to tell wich player won the obby. But I have no idea why this won't work. Can somebody help me/explain it?

finish.Touched:Connect(function(hit)
	local player = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
	if player then
		if not debounce then
			debounce = true
			player.leaderstats.Carrot.Value = player.leaderstats.Carrot.Value + 1000
			print(player.Name.." has won the Carrot Obby and recieved 1000 Carrots!")
	    	for _, plr in pairs(game:GetService("Players"):GetPlayers()) do
	        	if plr.Character then
	            	plr.Character.HumanoidRootPart.CFrame = spawnpoint.CFrame
					print("All players have been teleported to: "..spawnpoint.Name)
					
	
	       	 	end
			end
			game.StarterGui.ObbyGui.WinText.Text = (player.Name.." has won the Carrot Obby!")
			game.StarterGui.ObbyGui.WinText.Visible = true
			wait(5)
			debounce = false
			game.StarterGui.ObbyGui.WinText = false
			
		end

	end
end)

Ok so the problem is game.StarterGui it is not good to do anything to gui from the server, if you rlly need to change the player's gui from the server then use a remote event that fires a client or fires all clients.

 game.StarterGui.ObbyGui.WinText.Text = (player.Name.." has won the Carrot Obby!")
game.StarterGui.ObbyGui.WinText.Visible = true
wait(5)
debounce = false
game.StarterGui.ObbyGui.WinText = false

You could use a remote event instead, I put a local script inside of the gui and a script inside of part:

--Script(Server)
local winner=game.ReplicatedStorage.winner

script.Parent.Touched:Connect(function()

game.ReplicatedStorage.ShowGuiFromServer:FireAllClients()
end)

Now this is the Local script inside the gui:

--Local Script Client
game.ReplicatedStorage.ShowGuiFromServer.OnClientEvent:Connect(function()
script.Parent.Visible=true
script.Parent.Text="The winner is ".. game.ReplicatedStorage.winner.Value

wait(10)
script.Parent.Visible=false
script.Parent.Text=""
end)game.ReplicatedStorage.ShowGuiFromServer.OnClientEvent:Connect(function()

script.Parent.Visible=true
script.Parent.Text="The winner is ".. game.ReplicatedStorage.winner.Value
end)