This is not free money. It’s a loan. You will pay it back. So don’t blow it on a spa day or a collection of decorative spoons. Use it for essentials: rent, food, bills, and maybe one token treat like a triple-chocolate cookie. You deserve that cookie.
Also, if your Universal Credit stops for any reason, the repayment doesn’t vanish. The DWP will come for it through other means. So stay on top of your claim like it’s a houseplant that needs water—neglect it, and it dies.