It is easy to think so but I see no evidence that an unusual amount of cheating occurred. There has never been an election which did not have cheating.
Fraud works only when an election is close. These elections should not have even been close.
If the Demons cannot be defeated when they had to run against the accomplishments of the Trump administration, then the game is over.
Specifically I think there was rampant voter fraud from non-citizen voting orchestrated by the Dems, and the close margins were due to the left again miscalculating the osupport of Trump's "America First" agenda by actual citizens.