In 2020 and 2024, there was seemingly every motivator or incentive there could possibly be to get Democratic voters to turn out and vote. Nobody could claim the stakes weren’t high - the stakes were immensely high. Nobody could claim they didn’t know what 4 more years of Trump would do - there was overwhelming proof of how horrid Trump was. Nobody could claim that there was insufficient spending to get the vote out - Democrats spent enormous sums in 2020 and 2024. Nobody could claim Democratic voters weren’t personally going to be affected - an enormous number of women, LGBT people, racial minorities, etc. were going to be seriously affected by a second Trump term. Nobody could claim there wasn’t enough advertising - there was a tsunami wave of campaign ads, PACs, lawn signs, etc. Nobody could claim that it was because “Biden is too old” - Biden wasn’t the candidate anymore by that point.
Yet, despite all that, the Democratic vote turnout was meager relative to what was at stake. Sure, it was high enough to beat Trump in 2020 - but that was only by a whisker. (A mere 44,000 votes in Arizona, Georgia and Wisconsin was all that separated Biden and Trump - a large high school football stadium’s worth of people.) And in 2024, of course, it fell totally short of and Trump again swept the swing states and won.
Sure, the Electoral College discourages Democrats in safe blue or safe red states from voting, and there is voter suppression going on, but even then, the turnout by (D) voters in swing states was anemic. They literally had no election in their lives more important than this, and yet still couldn’t be bothered to turn up to vote in numbers that would make a decisive difference.
So, what else can the DNC possibly do to get the Ds out to vote in higher numbers? Have they hit a ceiling? Every single possible incentive and motivator was there in 2024, and the D rank and file - even in the swing states - still didn’t crack a ceiling of around 65% at most. It was like having a five-alarm fire and only three firefighters show up.