DIY is one of the best ways to reduce conspicuous consumption and consumerism. Learn skills to make what you need rather than buying it. Learn to reuse materials as part of that process, and repair things back into working order.

My favorite example of this is IKEA wood bed frames. I used to cruise around cities just picking up truckloads of perfectly good solid wood that people left on the street, and then would have endless supplies for building. I've built raised garden beds, new custom bed frames, awnings for porches, bird feeders and houses, tables, stools, shelves, and more, just from junk left on curbs.

One time I found a pretty much fully functional sewing machine on the curb. That's when I learned how to sew, and have since repaired jeans, shirts, socks, and made little tote sacks as gifts out of old clothes.

Once you learn a DIY skill it serves you for the rest of your life, saves you money, and helps the environment.