Looking at this from just a common sense perspective...
In 2020 Biden beat Trump pretty handily. Enough so that anyone who wasn't trying to overthrow the election knew all the trump stuff was bullshit.
Since then trump has initiated an insurrection, stolen classified information and potentially sold it to our enemies, been arrested and charged in a multitude of federal and state crimes, been tried and convicted in NY or 34 felonies, has had almost everyone who worked in his administration either get arrested or call him a fascist, and has gone all out cranking the racism and fascism up to 11.
Meanwhile, the country's economy under Biden/Harris has been strong, there have been no major scandals, no major disasters, no recessions or depressions, and every day American life is pretty much stable post pandemic.
Nothing points to a close race. I think the vast majority of voters are just tired and fatigued by the nonsense and want no part of polling.