Some ideas.
Low-impact hobbies like writing, drawing, cooking, baking and knitting can provide entertainment in addition to fulfilling actual physical needs.
Mending your own clothes, and wearing natural fibers.
Foraging is a really good one. Even with limited resources you can learn to forage much of your vegetables, fruit, and herbs. If you have more time and the right equipment, try nuts and acorns. Learning to preserve food makes a big difference too. I’m about to make jam out of around 10 pounds of frozen wild raspberries I picked last year.
Taking a walk or going to a local spot instead of driving far for experiences. There’s so much to be found locally wherever you are. Also consider
“staycations” instead of typical vacations.
Learning to cook from scratch, and with bulk
staples, cannot be overrated!
Same with thrifting and salvaging household items.
Of course, there’s a lot more actions I could name- mostly big ones, and probably things most Permies are already working on. But these are some of my big tips. And these are things almost anyone can do, and besides helping the environment, can save you money and help you maintain good health!