Aspiring minimalist here*. We are being very careful about what we buy or what we choose to accept for free or as gifts, and have done that for a few years at least. Can't think of anything either of us want as presents or purchases, and somehow even though we have stemmed much of the flow of what comes in, it still seems that we have so much to give and share! For example we have never bought new towels of any kind in 15 years (actually, ever) since we were gifted about 12 bath size when we were married. I kept 3/4 of those in reserve for when the first few wore out, but years later the ones in use were still perfectly fine and fluffy and useable. I used the reserve towels a grand total of once when we had a window leak, and later after washing and more time in the cupboard finally gave the extra 8 practically new ones to a close friend who is close to the poverty line who I saw was using threadbare old ones.
Also, we both love books and used to buy lots of new releases and classics and enjoyed having a diverse personal library (2 shelves worth at most - but well loved). We slowly switched to the used bookstore trade-ins, where you get 1 new book for every 2 you take, and now we just use the public library for 2-3 titles per week. So nice to have someone else curate all those glorious books while we still get the benefit, but don't have to ever dust them or move them.
Currently living in our biggest place yet at about 1000 sq feet, but really 400 sq ft (the dining room) is unused and other things are spread out so we can easily downsize to something half the size. We don't plan to move due to great location and neighbours plus fair rent, but I really like that it keeps our options open.
Okay, humble brag time. We moved into this place 5 years ago, and the entire move took only 3 hours. That time includes everything: loading the truck with furniture and all our boxes (we were teased for having so many labelled books at the time), completely cleaning the old place and handing in the keys, and unloading on the other end with the bed set up and made and 2 shelves assembled and kitchen completely unpacked. We had about a dozen friends helping us, but all agreed it was the smoothest moving day they had ever seen. About half helped me clean, while half surprised me with the set up on the other end since there was so much time left over before lasagna and beer were being delivered. I have personally helped with 50+ moves of my relatives and friends, and definitely learned a bit from each of them but keeping things simple was probably our biggest factor to success. Since that time we have reduced our 'stuff' level by many, many boxes of little and sentimental things, but have acquired a much larger couch - probably balancing it out.
*We are not a 100 item household by any means - we filled a 15' Uhaul truck plus had some awkward items in 2 car loads (family of 2).