I still wear it as long as it matches what I'm wearing for the day. Strangely I've worn my silver GG belt more than my gold GG belt because I actually have more silver hardware on my accessories than gold. I actually haven't worn the gold one for months now, but will wear it soon as I just got 2 new
Gucci bags with gold hardware.
I will hold onto them probably for over a decade, as I tend to do that with my designer stuff. I still have some really old Gucci belts that I don't wear anymore belonging to Frida Giannini's time.
If you would rather sell it because you don't foresee yourself wearing it again, then I suggest selling it while it is still popular to get a decent resale price.