We also have to overcome gerrymandering, which SCOTUS just said is legal (as long as the GOP pretends to disenfranchise people for political reasons rather than racial ones). At the same time, we need to overwhelm voter suppression with enough genuine votes that it isn't effective. Same with the Electoral College, the illegitimate Supreme Court, and the Senate, which gives outsized influence to big, empty Red States and fight against the unlimited flow of dark money in politics...
It can all still be done, but we have to all vote, donate, and volunteer, as well be unified as you said. My big unity wish is messaging. No one can compete with Fox News because Right Wing Media is very good at staying on-message and we're a "big tent" party, but still; we have to be better at it...