Would it be possible to add some serious one time incentives for players in the END game Content to finish the game and escape, this deleting everything they own and making a new character?
What about adding extremely unique and interesting “unlockable” character customization options for besting the game and making a new character, ALONG with 2 permanent extra STAT points that you are given at level 1 after besting the game up to a maximum of 10 stat points total (could only finish the game and reroll 5 times before you no longer got extra stats)?
For the customization aspect you could give a player progressively more unique and fun customization options each time they reroll up to a maximum of 5 times, i.e. - 1st reroll after besting the game gets you 2 new hairstyles, 2 new eye colors ECT just 2 new of each, and each time you reroll you still have access to the ones previously unlocked for finishing the game.
Think using a 1st reroll hairstyle with a 3rd reroll skin palette and a 5th reroll eye color.
Maybe add skin palettes covered in tattoos or scars/wounds ECT and for the final and 5th reroll add undead looking customization options like glowing eyes and rotting limbs ECT?