I agree. It was the changing of the election laws under the false premise that it was too dangerous to vote in person that decided the election. The dems used the virus as a pretext to implement mail in voting. They did so with no proper or universal safeguards. That resulted in all manner of potential misconduct. It was a fiasco with Old Joe getting some thing like 90% of such votes in some areas. A ridiculous skewed result. Old Joe was maybe the worst presidential candidate in history. He had no support from anyone. He didn't even campaign. The only reason expressed to vote for him was dislike of Trump. And yet we are to believe that he received the most votes in the history of Presidential elections? More than wildly popular figures like Reagan, JFK, Bill Clinton or Obama?
Trump got more votes than any sitting President looking for a second term. Biden got more votes than any other President before him. In other words; both candidates got more votes than in any previous Presidential election.
The reason is a simple one; Trump fans turned out in larger numbers to prevent a Biden (as the polls suggested would happen) win and Biden got more people to turn out who wanted to ensure that Trump would lose (because the polls could be wrong, like in 2016, and they simply wanted to make sure).
There is nothing strange or suspicious about that.