I don’t know about other places but seeing a 747 now in the skies around the local airport these days is rare. I could be wrong but I think it is that they are for the most part long in the tooth and when airlines need to replace them other widebody options do the job. Also in terms of fuel consumption the comparable more modern aircraft are much better and that is a major factor in what flies for airlines today.
I never see them flying but always see a few at the airport.
I didn't realize that only around 1500 or so were ever made (as compared with over 8000 737s). So they are out there but they don't make up a big percentage of airborne craft you're likely to spy at any given time.