Shift?

Firstly, nothing about Trump has changed in regards to their authoritarian tendencies. They've always gone as far as the institutions will allow.

The difference is that under Trump one, the institutions suffered severe decay. Following that, Biden and the Democrats did nothing to hold accountable, repair, reinforce or put in add additional guard rails. And now we have a system in a severe state of decay with Trump more completely aware that the system was actually always too weak to stop him.

An additional point however because making this about Trump or at least only about Trump is problematic. These outcomes are the direct extension and goals of the conservative movement. Nothing about them are unique or special to Trump, who, depending on what day you get them, doesn't really seem to believe anything other than whatever glazes him personally. These outcomes are the stated and instated goals of Republicanism and the conservative movement for the previous 60 years. They always wanted to go this way, but they only found a vehicle to do so under Trump.

I put this out there because Trump will not last for ever and there can be no renormalization or rehabilitation of conservatism or Republicanism once he's gone.