For certain, I wouldn't have stayed cycling for the last 22 yrs. as part of my car-free lifestyle if I always had an annual mileage goal in my head. I think I might be appalled how much less cycling I did for certain years.

The loose goal I do have is: bike daily. If it's too icy/snowy on pavement on certain days to start off, forget it. I walk or take transit. The other goal is at least 1 touring bike trip for several days per year by cycling with my own pannier weight.

I also gauge my cycling fitness to relation to my health every new season. All of this helps me enjoy cycling year after year, decade after decade.

(I did track my mileage for first 5 years when I returned to cycling. It was initially a great motivator, then it started to wear me down psychologically when I didn't cycle much.)