I did it when I bought a house. Financially, I cleaned up my finances, got a bills account and cut out any wasteful spending as I enjoyed seeing the mortgage and interest I was paying go down.
Also, when I unpacked in the new house, I wanted everything to have a ‘home’, it to be non-cluttered and to only have things I loved around me. As I unpacked each room I decluttered and also bought nicer things to replace some things - but when I say nicer, I mean heirloom quality pieces that will last forever, not just end up in landfill (I got a lot from other people, not just stores too).
This made me realise I didn’t want gifts that would just be a waste and clutter my home (or be thrown out) and that lots of others probably felt the same! I actively started to suggest going to dinner, or a movie or concert or an experience as a birthday/Christmas gift for both gifts I receive and that I give (adult, not children....yet!) For those that do insist on gifts, I am very specific about what I want. The only people who still buy for me are very close to me, and no one seems to ave a problem with being told this, in fact they actively ask when I am sending them the list of three things to chose from (with links and a range in price).
Having the house in order made tidying and cleaning easier and gave me more free time. I also wanted to entertain in my home more, which meant nicer, more meaningful nights with friends and family and richer relationships.
I’ve never thought of it as rejecting consumerism, but I guess, I do live a life kind of not thinking about things now. I only think about things if Something has worn out and I have to replace something. I really love looking around and seeing my place being perf calypso in order with nothing more to get/that I need.