Most households have a specific category of purchase: things that seemed genuinely useful or exciting before they arrived and got very little use afterward. The air fryer used twice. The guitar. The stacks of books started and abandoned. The fitness tracker worn for three weeks. These purchases felt like good decisions at the time, and that is worth understanding.
You are buying the version of yourself that would use it
A lot of unused purchases are really purchases made for an idealized future self. The person who buys a bread maker is not just buying a bread maker. They are buying the version of themselves who bakes bread on Sunday mornings. That version feels very real in the store or while reading reviews online. But your actual habits, schedule, and preferences are harder to change than the purchase implies.
Ask whether you currently do the behavior at all
Before buying something that requires a new habit, check whether you currently have that habit at any level. If you want to buy a yoga mat so you can do yoga at home, ask whether you have done yoga at home, or at a gym, or anywhere, recently. If the answer is no, the mat is unlikely to create the habit. Equipment follows behavior; it rarely creates it.
The "borrow or rent first" rule
For any purchase above $50 that requires a behavior change or new hobby, try to borrow, rent, or experience it first. Many libraries lend tools and equipment. Friends often have gear they are happy to let you try. Renting a kayak a couple of times before buying one costs $40 and might reveal that you enjoy kayaking twice a year, which is a very different situation from one that justifies a $600 purchase.
Give yourself a usage commitment before buying
Before purchasing something, write down how often you expect to use it in the first 90 days. Be specific. Not "I will use this regularly" but "I will use this at least eight times before the end of October." After 90 days, check. If you hit it, you made a good purchase. If you did not, that record helps you recognize the pattern in your reasoning the next time a similar purchase comes up.
What to do with the things you already have
If you have a collection of things you purchased and did not use, selling them serves two purposes. It recovers some money and it makes the cost of unused purchases concrete in a way that abstract regret does not. Listing something on Facebook Marketplace and getting $30 back for something you paid $80 for is a more memorable lesson than just feeling vaguely guilty about it.