If she brought a bunch of charges that revealed the depth of his corruption, then maybe the American people would be justly outraged and put pressure on those in Congress to actually remove him from office. All this narrow Ukraine issue does is bore most people and enrage Trump's base. Just because mainstream media covers it non-stop doesn't mean it's compelling for most people or that it isn't esoteric. Watch the Sondland testimony and tell me that isn't esoteric.
How about doing what is right and throwing the whole kitchen sink at him and letting the chips fall where they may rather than play political games? Either that or actually oppose him on the issues and work to gain seats in Congress and win back the Presidency instead of this dog and pony show they know has 0 chance of removing him from office.
Sadly, no amount of pressure would change those votes. Republicans in Congress are far more afraid of Trump than they are of their constituents.
Pelosi has brought up issues and passed hundreds of bills while doing this. She was forced to do the trial because of Ukraine not the dozens of other crimes Trump has committed.