It's funny, since I started traveling and working for myself full time, minimalism has happened to me organically.
I usually visit my home country about once or twice a year and stay at my parents' place when there. Every time I am back, I go through stuff I still have stored there and toss out about 90% of it.
Right now, all that is left over there is 2 sets of winter clothes, and 2 drawers full of stuff that has emotional value to me.
The drawers contain a bunch of letters and photos from past lovers and other people dear to me, such as my grandma who has passed away. The drawers also contain a ton of items that would seem completely random to a stranger, such as a particular set of playing cards, an old bong, even a clothespin. Each item reminds me of a certain good time in my life, a person, an event, or other significant period of my life.
I call these drawers my "memory drawers". The contents go back to as far as I was a little kid and every time I go through the drawer, I'm having the time of my life.
As for the rest of my belongings, they literally all fit into my suitcase and daypack. I've optimized everything over the years and tend to go for high quality items that last long. Good laptop. Good suitcase. Good camera. Good jacket. Good workout shoes and so on. Day to day clothes can be replaced anywhere.
I must add though, if I lived in one place and wouldn't travel around, I would probably own more stuff. But I do think everything I'd own would add value to my life and be useful, else I wouldn't own it.