Here’s another perspective. The Democrats took the House by promising moderate and conservative Midwestern and suburban voters they would do something about healthcare, education, infrastructure, and education. Those votes were no mandate for partisan vendettas. But that is the focus of what you are recommending. No accomplishments. Just a pledge to fight Trump with a new cavalcade of sleazy moves. The Democrats are already seen as not as an opposition party but as a cabal of tricksters pushing illegitimate maneuvers from faithless electors, fraudulent use of the 25th Amendment, allowing illegal aliens to vote, allowing felons in jail to vote, making numerous false accusations, abusing the subpoena process, and pursuing a nasty politics of personal attack and destruction that violates previous norms. The Democrats bet it all on far-fetched charges of collusion, and lost. Mueller’s report can say Trump is flat out guilty of obstruction, but it doesn’t matter after you you’ve been screaming collusion for two years. The public wants you to shut up about this — they are completely sick of it. You’ve cleverly ended up with 0 credibility. Your plan for partisan release of taxes is symptomatic of what’s wrong with the Democratic Party. People understand taxes are confidential and don’t like the idea politicians can release them for partisan political reasons.
The Democrats need to reestablish themselves as a party with legitimacy and credibility, a party that will pursue its policies within the rules. More schemes, hoaxes, and dirty tricks will only cement opposition to your party. Doing what you were elected to do might help too.