My entire life since leaving home at age eighteen, I have believed in keeping things simple, and having less of things where I lived. This created less stress and more motivation when the place is tidy and clean. I will give some examples that helped me minimalize.
(1) I loved having just the basics for furniture in any room, like for the living room, it usually consisted of a new or newer matching comfortable chair, sofa and loveseat, with a coffee table or end table. And for the bedroom would just be the bed and one dresser.
(2) For clothes, I had a reasonable number of new outfits each year, like 5 pairs of pants, 10 shirts, and an adequate supply of underwear and socks. All these items must fit in the one bedroom dresser and one closet there. I just had two pairs of sneakers and two shoes each year. I preferred casual and semi-formal wear, and not formal wear, and as the latter takes up too much space.
(3) Any other extra closet in the apartment or home would be either empty, or to fit a major need, like to store a vacuum cleaner, broom, or a few large Tupperware containers that are clearly labeled with like important items in each. I usually had large containers for: the rest of the non-displayed sentimental items, one just for photo albums, one for books, and like one for extra sheets or another blanket.
(4) For very sentimental items, I would pick at most one to two to display each year, to prevent breakage, either by putting on the wall or on a night stand, or on an end table. Again, the rest I kept in a storage container and stored in my bedroom or bedroom closet.
(5) The living room walls would just have a few other items, like a few landscape or seascape paintings and one clock. Most other walls in the residence were bare.
(6) Any older item or smaller item that I did not use for about two years, or would not likely use for the next two years I donated or discarded and threw away.
(7) For paperwork, I kept only very important things, like deeds to any homes, titles to a car, drivers licenses, important medical reports, very important receipts, insurance or tax -related information, etc. I threw out all other paperwork. I only needed a smaller container or safe for these.
(8) For bathroom and kitchen items, I kept just the basics, too. This meant maybe 5 towels, 5 wash cloths, basic grooming and hygiene items, for the bathroom, and to be stored in a small container for the small items, and the towels in the bathroom closet, too. For the kitchen, I would not use all the cupboards and drawers, but just like one cupboard for dishes and glasses, one drawer for utensils, and measuring cups, one cupboard for spices, one for a few pots and pans, and one for smaller food Tupperware containers and ziplock bags
(9) It should be noted that for all the smaller and accessory things too, besides the big furniture and appliances which were new or newer, less than five years old, nothing was really old, except for some sentimental items stored away. This gave me motivation to keep the place organized, clean and not-overflowing.
(10) I would not worry about cleaning sinks, toilets and vacuuming every day, but every few days, but only clean up spills immediately. But, I would pick up objects usually that were out of place at the end of the day and put them where they should go.
By doing this minimizing and organization of things, this indeed made myself personally happier, more energized the next morning, and with less stress. I just always felt a cleaner and more tidy place would make my life easier. The dirtier and more disorganized it was, and the more items in the place, I felt this would create more work each day for me. I realize others rather have the opposite, including my wife, but she is receptive to many of my ideas.