Answering the OP, IF the recount concludes with ‘significant irregularities’ that look credible, it won’t put Trump back in office, or even invalidate the Arizona election.
In my opinion, what it might do is cause other states to do their own audits, and if they all found irregularities that were significant, the likely result would be the passage of more state laws similar to what Georgia has done before the 2022 midterms.
I have no opinion on the quality of the audit or the likelihood of finding anything, as I haven’t really paid it much attention. But there’s no way the U.S. would be headed towards any kind of ‘do-over’ election. I don’t think there’s any constitutional basis for that.