Voter fraud requires violating voting laws. Provisional votes are legal.
A close election would seem to always flip to the Democrats on a recount, even without fraud. I have seen many such results. It is a structural problem.
I am certain there is plenty of fraud of course. Mail-in ballots seem to be the principle vector. A turnout of 100% + in a precinct is the obvious tell.
I believe that close elections (less than 1% margin) should not be recounted, they should be redone.