+New Game - Design Idea. "Post Win" dialog and re-edit scenes.
Normally, I would never redo storylines or create another character to replay games of this nature. After all, it took me years to get where I'm at now.
However, I might be tempted to create a "+New Game" character and "replay" critical scene and story lines, IF and ONLY IF, the game dialog and scene changes to incorporate my main character's achievement and people speak and acknowledge them. Heck, throw in a statue, painting, bard's song, etc.
To go even further, imagine an "echo" battle where my new character play by a PC controlled main character and we both fight certain battles.
As a practical level. Boosted EXP to redo OLD content.