Reframe a large purchase you regret so you can decide what to do next, not just feel bad about it

It arrived, it was wrong, expensive, or both, and now the money feels doubly wasted because you also keep thinking about it. This separates what is already spent and unchangeable from what is still an open decision, whether to return it, sell it, or actually use the thing, and gives you one clear next step instead of another evening of regret.

I bought something and now regret it. Here is what I bought and roughly what it cost: [describe the purchase and its cost]. Reframe this for me by separating the money already spent, which cannot be changed, from the actual decision still in front of me, such as whether to return it, sell it, or keep and use it properly. Give me the single most useful next action given what I have described, and one sentence to say to myself that stops the regret from turning into more bad decisions out of guilt. Keep it under 180 words, calm and practical, no lecture about sunk costs.