This narrative is largely untrue. Scandinavia started to prosper only after they liberalized. Of course, there is a big difference between intelligent redistributionism which respects and leverages market forces, and the kind of socialists who implement rent control and government-run grocery stores.
Yes, New York is certainly falling apart. And the mayor is notoriously unpopular!
AFAIK democratic socialism was only relevant for a short while in some places in Africa 100+ years ago, there are no current countries with democratic socialism.