Basically just live below your means.
But that is going to be hard for most people in tech to do because most people in tech were raised upper middle class and they simply don't know how to live below that and a lot of the rest are not from the US and they're mostly just going to do whatever makes them fit in.
And unless you can get everyone with money to live like they don't (which you can't) that's not actually going to solve anything. Telling everybody to just change their lifestyle is not a real solution to anything anyway.