I definitely think the Democrats will win back control of the US House of Representatives next year, even with all the GOP gerrymandering, and I think they'll do it fairly easily (gain 20+ seats). But the Senate is going to be far more difficult to win back as there are simply more red than blue or even purple states, and so it will likely take a massive blue wave like 2006 or 1986 to give them a majority, and even then it almost certainly wouldn't be more than 51 seats. So I don't think they're going to win a Senate majority, and at most, if we're lucky, Cooper may win the open NC Senate seat and maybe they'll pull an upset and gain another seat somewhere without losing any vulnerable seats of their own.
However, I do think that Democrats should pick up some governorships and other state government positions around the country as the economy continues to decline. The Democrats will likely gain some state legislature seats too, although their gains in legislatures will be pretty severely limited by the extreme GOP gerrymandering in most red and even purple states like NC. NC Democrats would have to win at least 60% of the statewide vote to win even a bare majority in either house of the NC legislature, which isn't happening anytime soon, imo. But they might be able to gain a few more seats and thus give Josh Stein some real veto power in the legislature. Right now he's got veto power by a single vote, and unfortunately there are a few turncoat Manchin-style Democrats in the legislature who voted with Republicans to overturn some of his vetoes this year.