Don't participate in wanton consumerism.

This is the answer. And it comes with other benefits also.

I do okay financially. I don't have problems affording necessities. But I have found there is also a lot of satisfaction in being more self-sufficient, in relying less on supply companies to deliver my every need. And it saves a ton of money.

Food is a big one. I used to spend a ton of money on takeout, delivery, junk food. But here's the thing, basic cooking really isn't that hard. It doesn't have to take up a lot of time, especially if you meal prep. And the resulting food is both better in quality and better for you.

On that same thread, the grocery store is not always your friend. Especially if it's one of the big national chains. You will find much better quality produce at your local farmer's market, and it's often cheaper too. Certainly way more flavorful, the vegetable that was in the dirt yesterday tastes way better than the one that's been in a warehouse for a month. Happier chickens lay tastier eggs. Etc.

And there's a lot of stuff you can do yourself. A vegetable garden is a great place to start, if you have even a tiny backyard. Think folding table size. Plant yourself some tomatoes and put up a net frame so animals don't eat them, they will be the best tomatoes you've ever had. But planting and growing stuff is one of the most efficient ways to get food- Stick it in the dirt and water it and you get food for free!

Then think about all the shit we buy. How much of it do we really need? How much of it ends up in the landfill in a year or two? When purchasing things, think about the product entire life cycle and how each step will affect you. IE, Don't just think about the dopamine rush you'll get from unboxing your shiny new toy, or the novelty of using it the first couple times, ask yourself is it going to enhance your life owning it over the long term, and is that amount of enhancement worth its purchase price and the space it consumes?