I think the best way to avoid stuff accumulation is to throw away your TV. Or at least disconnect if from the outside world. Whether you think so or not TV makes you buy more stuff.

I like to buy verbs, not nouns. While I was working in the corporate world I lived very simply and saved a lot. I spent all my money on travel. Later I dumped it all into a startup. People talked about the riskiness of startups but I just thought of it as paying to do something cool.