There is no easy answer, and making a change this big is a monumental task. Personally I've still come to think that just because making this change is very hard, that's not an excuse for me to not try, because the alternative is so much worse.

What I'm talking about is what the academic degrowth research has been working on for the past 20 years. (What's under the degrowth umbrella is the current wave of discussions started by the 50 year old "The Limits to Growth" report.) Doughnut economics is also intimately related.

If you want to learn more, as it happens, there is a brand new book "Degrowth & Strategy" with a free PDF here:

http://mayflybooks.org/degrowth-strategy

Note: I haven't yet read it, but it has got a lot of endorsements and great reviews from the top researches on the field, so it should be good.

Andrew Yang's proposal in the last Democratinc party primary of replacing GDP with a 'national report card' seems like a realistic-enough approach. In fact, I'd say if one views Andrew Yang's platform as a whole (particularly the heavy value-added tax) through an environmental perspective, I'd say he had the best environmental proposals I've seen for any politician in my lifetime.