Best way to save: don't spend and just save. I think most people in the western world could easily save up if they just cut back their spending and cut out things they don't need.
I'm buying things second-hand mostly. This helps a lot

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

.
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.
I'd like to save up a lot of bitcoins for the next couple of years with the hope that I can go live in a cheaper country and live off them someday. If that doesn't happen I'd at least like to go traveling on my bitcoins.