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.
When I figured out how to run computational chemistry software on my home pc. It entirely changed how I saw chemistry because I could tinker and experiment with (virtual) molecules on a grand scale. Being able to run five maybe ten thousand simulations significantly increased my understanding.