Well, yes, to be frank.
Firstly, filling the docket. If a bill makes its way through the House, the Senate Majority leader has the option to put it to vote in the Senate or not. He can prioritise whatever he wants. Bills have already been sitting on his desk for months, and he was able to place the nomination hearing at the top of the docket. Adding more and more bills to the pile on his desk accomplishes nothing. They can be bypassed at his discretion without any additional time spent.
(On a side-note, I recall you yourself condemning the Democrats for putting through bills they knew would not pass the Senate).
Secondly, a general strike. Workers throughout America are not (even nearly) uniformly Democratic or Republican voters, but this nomination is widely seen as a
party political issue. The Democratic Party calls for a general strike, and it will receive the immediate rejection of ~40-50% of the workforce on that ground alone. Even non-Republicans would not want to involve themselves in a dispute widely seen as partisan. Add to that the regular rate of refusal to participate that any general strike would receive (just from concern about personal loss of income etc), though that refusal would undoubtedly be higher because this issue doesn't concern workers as directly and clearly as wage/safety disputes etc. Support for a general strike on these grounds would inevitably be
exceptionally low among the workforce; I'd imagine maybe 20% if we're being
really generous. Cue immediate and massive electoral damage for the Democrats for absolutely no gain whatsoever.
The only avenue open to them was organising protest, which numerous senators (including Harris) attempted to do in concert with non-profit organisations before the hearing.
All of this would be the epitome of gesture politics. No chance of success, purely for appearance.