I think the influx of illegals is part of it......many are catching on that they too are being replaced. I think the obviously corrupt lawfare is part of it. They can identify with Trump more after seeing him be clearly screwed over by corrupt prosecutors and feds. Part of it is just comparing the record. Under Trump we had peace abroad and prosperity at home. Under Biden we have war abroad and a crap economy at home.
Deep State found this out the hard way in 2016.
They solved the problem in 2020.
Now they are fine tuning the fix.