Another major simplification I've done was to dress almost the same everyday. I own multiple items of the same clothes. All my tshirts are the same, all my socks/underwear are the same. I also buy the same shoes and jeans again and again. I look better and I feel much better!
I also quit all social media except LinkedIn and HN and stopped reading the news.
The thing I'll try next is to eat the same meals everyday. Maybe it won't work but I'll try it.
I would also like to live in a bedroom with not much more than a futon and a desk. But it's going to be hard because my girlfriend doesn't share my enthusiasm.
This is anecdotal, take it with skepticism if you want, but I regard this changes as some of the best decisions I made in my life.