It's important to note that these are just things I do personally, and you can take whichever ideas are easily adaptable to your lives!
We currently consume more resources than necessary, and it goes without saying that this is not a sustainable way to live. All the resources we use for our current lifestyles — from food to clothing to transport — are not infinite. At the rate we're using them, we're not giving the Earth enough time to replenish the materials. It may seem insignificant, but buying less and being more mindful of what you do buy can make a big difference. When shopping, I usually ask myself whether I really need the item. It could save the planet and your money in the long run!
This might have a few people groaning, but transportation accounted for the largest portion of total US greenhouse gas emissions last year. I’m not saying you should stop driving altogether, but being conscious about car usage or seeking alternative options on specific days could be a start. You could take a walk or ride a bike to your destination if possible, and this could also get your steps in for the day. If you can’t avoid transportation, taking public transport (if available in your area) could also help as it reduces the number of vehicles running at one time as well as things like traffic.
This one can be a bit hard for many people because high-quality options are usually more expensive; however, I'm a big believer that they'll be worth it in the long run. High-quality options are often more durable and made with sustainable materials which means you won't need to replace them as often as cheaper, low-quality products. Also, you can often score some great quality items for cheap at thrift shops or Facebook Marketplace!