The reasons for the fall we know (the real reasons that is!)

The voters were unenthusiastic?

By logic, this increased (and especially) mail-in voter participation in 2020 could have been engineered and manipulated. The possibility is certainly there.

I remember at the time I looked at the statistics and thought "No way José" and commented. Since 2020 they tightened on voting procedures with apparently 100 Republican lawyers per state being committed to checking, this 2024 election procedures. Some reports are in that stopping the recount of votes was challenged and resumed unlike the 2020 one, for example.

It's not that ridiculous to my mind. Many prominent pundits have commented on this.