Hello! I recently replaced a bird feeder in my backyard in Brooklyn NY. The old bird feeder, which attracted a lot of birds, needed to be replaced. It was plastic with a metal bottom and the bottom rusted out. The new feeder is metal. I set it up with basic Northeast wild bird feed. But the birds are ignoring it. It's been about a week and they have not used it at all. Any suggestions to have them start using the bird feeder? Thank you!