Everyone to their own, but after a month of ownership, I've made a few "upgrades" to mine.
Palm grips (done by LBS)
C/F bottle cage
Bell with Apple airtag
De-stickered wheels / forks / frame
Swapped Marathon+ tyres for Super Moto's (28/29 x 2 inch front 28/29 x 2.4 inch rear)
Swapped Tektro...