The path to victory for Ds is the same as it's been, if not even easier: a diversifying electorate, toxic opponents, and stricter scrutiny of gerrymandering.
Look, Trump walked a tightrope, narrowly flipping about the only states that could flip against a candidate whose unfavorability ratings were challenged only by his own. Now the Rs are saddled with an extremely toxic and incompetent poster boy for the next four years and will have limited ability to de-detoxify themselves.
Stay the course and keep fighting voter ID bullshit and this shit can't help but improve for the Ds.