There's a [1] hypothesis that economic growth is
mostly the result of 1) population growth, 2) energy consumption, and 3) interest rates.
Current projections estimate that population will peak at 8.7 billion in 2055. Nearly all of that growth will occur in "developing" countries. Yuval Harari makes the case in Homo Deus that the world is quickly reaching a point where the less developed areas of the world will be mostly ignored and left behind in the coming years, as the developed world has reached a sort of critical mass that it makes more sense -- economically -- to keep investing there.
As technology continues to get more and more efficient, it is quite possible we are near peak energy consumption.
Interest rates have been around 0% for quite some time.
To me, it's interesting to wonder if we live in a world that might "objectively" be getting better, but we don't see the verification with the same type of economic growth that's occurred in the past.
[1] - https://ourfiniteworld.com/2012/08/29/the-long-term-tie-betw...