No fraud, other than Trump cutting into Biden’s margin by having the US Postal Service “lose” mail-in ballots in heavily Democratic areas like Philadelphia and Detroit.
I think that both the Senate and House of Representatives will flip in 2022. Rs will gain from House reapportionment (although not as much as they think — in TX the new districts will have to be Democratic districts). But the Senate map is difficult for Republicans in 2022, with likely D pickups in NC, PA, and WI (retirements), and competitive races in IA (Grassley will be 89) and OH.