Everything depends on your definition of "cheating". The rules surrounding voting laws, and mail-in ballots specifically, were gradually changed over the course of 2019, culminating in the permission for late-arriving ballots, in some cases without a postmark. As far as I'm concerned, the framers of the constitution established an Election Day, not an Election Month, and they did so in a time when voters would travel by horse and buggy over treacherous terrain in order to vote - I don't think the current situation is even remotely on the same level as far as obstacles go. There is no constitutionally enshrined duty to vote in America - you vote on Election Day or you choose to vote by mail at an earlier date - early enough to account for delivery. If you didn't make it before the deadline, I don't see why the state should make any concessions to tabulate your vote - you were late, sorry. If the election was fair and by the book, it would've been done and dusted on the day.
That’s neither here nor there though - I think we saw a historic turnout and both candidates did exceptionally well within their respective camps. Trump may have lost as far as the current count is concerned, but I'm quite satisfied with the huge gains made in the house and senate, which leads me to believe that his mission of changing the direction and tenor of political discourse in America was a success, which is all I had ever hoped for. It was good to see the White House be a house of the people for four years, now it can be the house of the establishment politicians again, but you can't turn the cultural shift around anymore, which is a good thing. I suspect we will see similar gains in 2022, and if the GOP stumbles upon a good candidate, 2024 is going to be interesting.
In regards to fraud, I think it's childish to believe that no fraud at all has occurred - people cheat at parlor games where the stakes are almost nothing, anyone who thinks that no cheating takes place when the stakes are astronomical is a fool. Whether or not it was isolated instances by rogue actors or a co-ordinated effort is not for me to decide - any allegations of fraud should be investigated, even if only to maintain the public's trust in the system.
Do I think the election results can be overturned? I don't think so, at least not based on the current legal challenges. Trump's team would have to establish that the tabulation system was unreliable from a technical standpoint, and as such, its tabulation cannot be trusted, which would be a huge feat. Some of the "glitches" certainly point to that conclusion, but one would have to show that these problems occurred in multiple locations - I'm sure not all of the miscalculations were caught there and then.
In any case, it sure was a tight election season. Highly entertaining and full of twists and turns, that's for certain.