Doesn't have to be a thing you bought. Just some thing you didn't have but then once you did it expanded your scope of actions.
The first obvious example that comes to mind is a car. Plenty of drawbacks to prevalence of cars, but being able to go where I want when I want, and far away, is very transformative.
I'm interested in other examples of things that aren't just useful, but that open new possibilities.
I had a teacher advise me to make a habit of occasionally seeking out embarrassment, to stay in the habit, and prevent being paralyzed by fear of embarrassment.
I've followed that advice for years, and it's like a super power.
I've done so much cool shit that a previous version of myself would have been afraid to try.
I don't even remember all the embarrassing stuff, even though there's plenty. The cool stuff is what sticks in my memory, even though I'm prone to remembering my mistakes.