Putting aside the fact that anybody using the term “democrat party” wasn’t ever going to vote for a Democrat in any case… but let’s pretend you’re serious.
People who don’t vote are irrelevant to what the Democratic Party does. Only people who vote matter - if you can’t be bothered to pick among the candidates that you can pick between, nobody cares what you think or what you want. You’re not worth going after - you only focus on people who will vote.
Have you noticed how the Republican candidates literally get worse in every succeeding election? It’s because the zealots reliably vote for the most fascist adjacent candidate, the rank and file vote for the slightly less bad candidate, and year after year more and more of the moderately sensible ones quit the party in disgust. So the Overton window in the Republican Party ticks over to the right every election cycle. I’m old enough to remember when we all were positive the Republicans couldn’t get any worse than Reagan. But every election since has proved me too optimistic.
Democratic voters could move the party similarly to the left over time, but only if they’d reliably show up and vote for the further left candidate each and every time. But they don’t bother, so the national party keeps ticking over to the right chasing the Republicans.
There’s a lot of bad things to say about people who want what the Republicans are pushing, but you can’t say they aren’t committed.
Apples and oranges.