Congress can pass gun control, private prison ban, drinking water safety, solar freedom (preventing utilities from squashing solar), and public option bills. They can pass a bill authorizing the post office to operate personal banking services.
While waiting for the corrupt immoral and incompetent Senate to pick any of these bills up, they can investigate the shit out of the trump klan, the dirty dirty GOP, NRA, KKK, GRU, Fox axis, and the petroleum industry as well as all the rapey new GOP judges.
The new American Majority can pass these bills and have the subpoenas flying by Valentines Day.