>>1768067upgrade pedals
if you actually ride it fixed, get some cage pedals, otherwise, better flats. these are good:
https://www.aliexpress.com/item/1005001871077322.html?
get a bottle cage, that'll brake up the frame solid colour a bit. Silver imo.
upgrade your front brake pads to kool stop or shimano cartridge
get some high quality grips, ODI, Oury, something cool, yellow imo, yellow + celeste is a classic combo, look at pantani's bianchi
and get some Colnago / columbus tubing stickers or something on ebay for it. De Rosa, Battaglin, pick something fancy.