When you spend money on things you "do", instead of things you "have", you experience more in-the-moment happiness, which brings you more joy.
Practicing mindfulness by living in the present will bring more joy than worrying about various time travel what-ifs.
You're not in the past or the future, you are in the now.
When we do things with others, we often enjoy the experiences more because we're creating shared memories together.
Even the anticipation of an experience has been proven to make you happier than the anticipation of a thing.
Looking forward to a vacation soon to be filled with new memories will bring more joy than planning to buy an object like a phone you will only stare at alone.
Things won't make new memories, but they will make a giant hole in your wallet.
"Houses are full of things that gather dust."
While money can buy some happiness, it is only up to a point, and this is because humans are very adaptable creatures.
The shiny new thing you buy today may be exciting for a bit, but then you adapt, and it quickly becomes boring, potentially even leading to a worse feeling - buyer's remorse.
If you spend your money on experiences such as traveling, activities, art, attractions, food, drinks, or anything else that you can "do" and that makes you happy, then you will store long-lasting memories that, unlike things, will never lose their value.
Who we are becomes a sum of all of our experiences, not a collection of our things.
"Stuff is not passive. Stuff wants your time, attention, allegiance. But you know it as well as I do, life is more important than the things we accumulate."