Howdy partners again.
I suggest reusing content that had been done well and include it into mini events for future seasons. Every successful seasonal game is good at reusing old content in future seasons if it was good.
For example right now we are doing vortex every day and some mini dungeon events that are not really exciting , we appreciate the rewards they include but it doesn't do anything gameplay wise, i would suggest once in a while ( idk 2 weeks (random)) give us a mini event like fighting the copper dragon again, so it's not wasted resources into building a boss we only see one time for couple of days in season 1, that goes for future bosses too , we just need more player vs player ladder type of content that is not only vortex or Hard training events etc.
edit: i had to put in a note that i like what you did with s2 old zones and made mini fights there with little rogue like playstyle with rolling bonuses i think that type of gameplay can be improved on even further.