Not every Dem suffers from severe TDS. Some have a more positive outlook.

https://economictimes.indiatimes.com/news/international/world-news/lets-make-final-2-yrs-of-his-presidency-most-productive-talarico-urges-dems-to-work-with-trump/videoshow/135811194.cms

It might be a serious waste of political capital for the Dems to accomplish nothing more over the next two years but harassment of a lame duck President.