I'm buying things second-hand mostly. This helps a lot

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I could prepare my own food and bring it at my job but I'm too lazy for that

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I think the best step is : work remotely (digital nomad) and go live in a cheap country. In Europe it's Portugal, Lithuania etc...
SE Asia is good as well. Cambodia is providing unlimited resident visa for ~300$ a year for example and you can live there quite cheap.
That's a thing I want to experience but now I'm a young wage slave in Tokyo with an emergency fund of 500 000 yens.