I know no such thing. A high GDP per capita might not be required to have a thriving society in the modern world but surely there is a lower limit. It should be possible to at least roughly quantify that limit. Could we still have a thriving society if GDP was cut to, let's say, $10000 per person?
I don't have that answer. But I see no evidence that the United States benefits—as a society—from our high GDP.
Would we be better off with a lower GDP?
I don't know. But we certainly would be better off if we optimized for other metrics besides GDP.
Which other metrics should we optimize for, and how should those metrics be weighted relative to each other?