The US seem indeed to be moving toward a more authoritarian regime, and I fear that the question of what the Democrats will be able to do once they are in power will be postponed until much later.
By definition, Trump cannot lose an election. Prosecuting the January 6 rioters was a "grave national injustice." Big law firms are being urged to bend the knee. The military has been sent to the largest city in the largest state governed by a Democrat.
I don't see the Democrats winning an election for a long time.