Dem elections can be summarized as "upholding the status quo." Americans want change. In 2016, Americans voted to break away from the status quo with Trump. In 2020, Americans voted to return to the status quo with Biden. In 2024, Americans remembered the status quo sucks, and voted to change it again with Trump again.
Change won all three elections, but Dems only got to campaign on change by virtue of being the opposition party for one of those three.
That sounds right to me but is both a little hopeless (I guess we'll just flip flop the presidency term-to-term forever?) and disagreeing with the premise of "pro-corporatism" from the OP.