At this point I think Trump is just making things worse by not conceding.
With all the mass-mailing of ballots and unstaffed ballot drop boxes, any voter fraud that may have occurred will be impossible to distinguish from the general chaos and lack of verification.
That's probably exactly what the Dems were going for when they instituted these "Covid measures" - and they won.
After failing to prevent those measures ahead of the election, the only way to beat them would have been a landslide win too big to fudge, and Trump didn't achieve that.
So, Republicans should take the L and live to fight another day.
Don't prove the twitter blue checkmarks right who were crowing about Trump refusing to honor the peaceful transition of power.
Don't self-destruct the GOP, and any chance they have of asserting themselves as an effective opposition against President Biden, by loosing yourselves in an obsession with possible voter fraud that will never be proven.