There’s no functionality for what you’re asking currently.
You’d have to create a command to have the admin buy the tickets, as it does not exist.
You can give the users the points back, but it’d be manually.
If you really want the giveaways to work through bot restarts; you’ll have to modify the code to log all the users into a text file or similar, then load in on startup. But, the bigger the raffle, the longer the load time.
Long story short, you’d have to write code for a realistic solution.