Here's what I have. I made some assumptions that I wish not to come to pass. Undecided voters shift to Biden, whose partisans cheat considerably in his behalf. Here's the result:
And for the Senate. No Republicans are secure, and Democrats can win big. Consider also the likelihood of coattails and reverse-coattails. We need to work harder here:
And for the House of Representatives. Because of a lack of poling data, this one looks tricky. Basically, if polls don't show a Republican win, and the presidential vote index is close, I assigned it to a Democrat, if one is on the ballot. I did not account for any incumbency advantage. This map corresponds to the presidential scenario earlier with the same degree of shift in voter attitudes and Democrat sponsored cheating. So, consider this as a worst-reasonably-possible scenario for each district, and campaign and vote accordingly, because the American experiment depends on it: