The best approach is to simply file impeachment papers now and methodically do that work in the committees, whether or not it gets much attention. It will likely only get much attention when the most outrageous violations of law are highlighted. This will work to the Democrats’ advantage over time.
Then the important part politically: we simultaneously pass in the House all of the bills that are extremely popular on education, healthcare, climate change, and civil rights, and make it much more apparent to independent voters that the Democratic House is working on behalf of the American people and Mitch McConnell is sabotaging the will of the people.
Pelosi would not do this even if she wanted to without a groundswell demanding it.