Not sure I agree with the conclusion of the election results, Gregor.
It has been a grab bag of centrists, leftists and right wing democrats all winning and losing about the same.
Beto, Gillum, Ojeda etc represented degrees on the right/left spectrum. All lost.
We got DSA candidates in office up and down the ticket. The centrist running in my district got hammered,for good reasons, running a resume campaign much like Clinton.
It took 35 years for the neoliberal project to vanquish the new deal. My guess is that the DNC will become more reflexive and shrill demanding a move move to the center (further right).