Add Leaderstats Value Through a Remote Event?

I have an animation game that after I play an animation it adds +1 value to my leaderstats. I used a remote event to fire to the server and add the value there but it does not work.

Local Script:

aughhButton.MouseButton1Click:Connect(function() -- AUGHH Animation

    -- Variables
    local humanoid = rig1:WaitForChild("Humanoid")

    -- Camera
    camera.CFrame = aughhCameraPart.CFrame
    camera.FieldOfView = 40

    -- Main
    frame.Visible = false
    humanoid:LoadAnimation(aughhAnimation):Play()
    aughhSound:Play()

    wait(7)

    frame.Visible = true
    aughhSound:Stop()
    humanoid:LoadAnimation(aughhAnimation):Stop()
    camera.FieldOfView = 70
        remoteEvent:FireServer()

end)

Script in Server Script Service:

remoteEvent.OnServerEvent:Connect(function(player)

        player.leaderstats.Plays.Value = player.leaderstats.Plays.Value + 1

end)

and if you can, help me make this more secure. thanks :)