How to save the value of a script being disabled?

Hi, I'm working on a gui that lets you get levels and if you reach a certain amount of levels, you complete the quest and it gives you gems which can be used to buy other things, the problem is that I'm not sure how I would save it.

This is the script:

local player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:Connect(function()
    if player.leaderstats.Levels.Value >= 100 then 
        print("Has Gems!")
        player.leaderstats.Gems.Value = player.leaderstats.Gems.Value + 100
        script.Parent.TextSize = 22
        script.Parent.Text = "Completed"
        script.Disabled = true
    end
end)

I want it to save the completed text and the disabled value in the script.

Thanks In Advance!