I gave this a "like" earlier, but I wanted to come back to it. It's absolutely scandalous that voters in Wisconsin were forced to go out and vote today, against the wishes of the Democratic governor. (With the support of the Supreme Court, I might add.) Republicans have long proven that they will try to win "by any means necessary," (voter suppression in a huge way, gerrymandering districts...which happens on both sides, to be fair,) but not, as you suggest, by changing their policy platform to be more appealing to a wider voting majority.
Another thing this does bring up, however, is why do we drag out our primaries so long? COVID-19 aside, which has changed a lot of things about this election cycle, my state, NY, wasn't going to vote until 28 April, anyway. Bernie has dropped out. This makes the presidential primary vote in populous states like NY and NJ inconsequential, even if we voted on schedule. When things go back to normal, I would suggest that we tighten up the primary schedule. More states and diverse states to vote in the first weeks. Get a real bead on who is viable. Then by Super Tuesday or shortly after, have most of the states accounted for. Who does it serve to string it out so long? I get that the candidates want to cover as much ground personally as they can, but why do they matter more than the enfranchisement of the voters?