A similar concept but done differently would be preferable.
20 Bring back the Trouble Center this time with the ability to tackle more than one quest at a time.
I think that having sidequests be discovered via actual character interaction would be better. Just give clues to what NPCs are involved in sidequests. Having the talk icon be altered when near such NPCs would be a very basic example.
23 Have stronger versions of most items (Normal, Shiny, and Flashy)
Or maybe have the items have actual diversity and feel less redundant? --- More villains need to be protagonists. BIS proves it can work. Ridley, Ganondorf, Fawful, Bowser, and Dimentio all for their own games!