You need to let go of the illusion that there was any actual permanent "deal" in place at all. What was in place was a temporary stopgap at best, and Iran would exit from that stopgap with multiple avenues to building nuclear weapons within a year or two after the expiration of its provisions. If the goal was to prevent Iran from building nuclear weapons, the "deal" didn't accomplish that at all, it merely postponed it. Letting an extremist theocratic regime (and a known sponsor of terrorism) eventually arm itself with nuclear weapons in a powder keg that's the Middle East seems like a terrible deal to me. Much worse deal, in fact, that not doing anything about North Korea for two decades.
Now they have started enriching uranium again, so they are theoretically moving closer to building a bomb. To stop that without Iran's co-operation would require force, so if the West finds a bomb unacceptable the West is on a path to war.
For all your criticism of the deal, you haven't addressed the fundamental question of how this situation is better than the deal. Interpreting Iran's provocations as signs of progress towards negotiations is not convincing.