Best hope is for a coup from inside N Korea from the sections of the ruling class and the military who are opposed to Kim and want a relationship with the wider world which can then insight a general mass public uprising and oust him and his supporting regime and supplant him with a more tolerant, open government that wants dialogue with the UN and ceases the aggression, ultimately leading to the country becoming normalised
The majority of regular citizens in that country are as we know oppressed and living in poverty and secretly hate the restrictions imposed upon them but have to stay silent and keep up the facade of worshipping the dear leader
Problem here is it obviously needs somebody to be the first to break cover which nobody really wants to do as they would be the first to fall, plus Kim's regime has all the resources and would most likely quash it ... look what happened in Turkey when they tried to oust Erdogan, that was put down easily