All these special elections show a pattern that in areas where Trump cratered, Democrats are not able to do much better than Clinton did. In areas where Trump did well, or rather Clinton didn't do well, the Democrats are ascendant. It basically shows that a traditionally Democratic leaning district that voted by 10 points for Trump should be just as much of a target as districts like GA-6 where Trump barely won.
Democrats need to have a 435-district strategy.
The fight beteeen the strategies of Rahm Emmanuel and Howard Dean created a powerful balance in 2006 and 2008. With Schumer overseeing it, the Democratic victories then were only created because Dean and Emmanuel poured resources into their opposing strategies, strengthening the Democratic brand across the nation.