Economically, most national Democrats are about as conservative as Carter, if not further right. Carter is in many ways the progenitor of the neoliberal wing of the DNC; he brought back Progressive Era views that had previously been sidelined by the New Deal.
Socially, Carter is some probably slightly left of the DNC’s national position.
This doesn't sound right to me. The modern Democratic party isn't very fond of mass deregulation, balanced budget drives, or quantitative tightening, which is pretty much Carter's economic legacy. And while Carter's very socially left wing now, I doubt he supported, say, gay marriage, when he was president.
The difference is modern democrats are living in a world after 40 years of deregulation so it’s much less obvious whether further mass deregulation would be beneficial, Carter’s balanced budget emphasis was borne out of the mistaken idea that inflation was being caused by Federal deficits, and there’s no exceptional Left resistance to JPow’s rate hikes and tightening.
His other policies were largely in line with center-left policies of today, mediating conflicts, reducing dependency on foreign oil, renewables investments, expansion of federal health care support, massive expansion of parks and conservation land, established Superfund, supporting marijuana decriminalization. On gay rights, he was the first president to meet with any gay marriage proponents and he worked (with Reagan) to defeat the proposed California law that would ban gay people from teaching positions (history doesn’t repeat but it often rhymes).
Socially, Carter is some probably slightly left of the DNC’s national position.